"Till the World Ends" received universal acclaim from critics, who deemed it a catchy dance track and complimented its anthemic nature.

"Till the World Ends" attained international success, charted on the top-ten in several major music markets, including Australia, France, Ireland, New Zealand, Sweden and Switzerland.

[15][16] Spears delivers confident and breathy vocals, in lyrics such as "If you want this good shit / Sicker than the remix / Baby let me blow your mind tonight.

[6][17] Keith Caulfield of Billboard said the chorus "comes on hard like it's the sexy spawn" of American recording artist Usher's "OMG" (2010) and Italian band Baltimora's "Tarzan Boy" (1985).

"[25] Gerrick Kennedy of the Los Angeles Times called the song "catchy [...] [it] makes you want to grab some glow sticks and hit the clubs" and added that the Femme Fatale era "already shows an undeniably more confident Spears.

[16] Bill Lamb of About.com commented that the song would "sound solid on the radio and bring crowds to the dance floor," but when compared to "Hold It Against Me", it was much safer and not as innovative.

[26] Jed Gottlieb of the Boston Herald gave the song a B+, saying that "pop fans always need a huge hook, catchy chorus and break-it-down-build-it-up bridge.

[27] Edna Gundersen of USA Today called it "a sleek and impossibly catchy slab", and said that although the song is unmistakable Luke, Spears "holds her own with confident, kittenish vocals.

"[1] David Buchanan of Consequence of Sound commented that "Till the World Ends", "Hold It Against Me" and "Inside Out" "simultaneously send Spears back to basics vocally, and into 2011 sonically.

"[30] Rudy Klapper of Sputnikmusic said that the song "throbs with trance-y synths, a thumping electro beat that is pure sex and a chorus that goes and goes as only the best club hits can do, sensible lyrics be damned.

"[12] Evan Sawdey of PopMatters said that "Till the World Ends" sets the pace of Femme Fatale, while calling it "a stadium-rocking pop anthem.

"[31] Keith Caulfield from Billboard said that the song has a "roof-shaking chant-chorus", but criticized the lyrics, saying that they have "been echoed incessantly over the past year in countless Hot 100 top ten hits: dance until you drop from exhaustion.

The writer concluded, "Brit[ney] delivers the Apocalypse Now of Eurotrash electrotrance disco songs, as that throbbing pulse builds to a pure drop-the-bomb chorus.

"[35] The Village Voice's Pazz & Jop annual critics' poll ranked "Till the World Ends" as the seventh best song of 2011, tied with Lana Del Rey's "Video Games".

[36] A remixed version of "Till the World Ends", featuring pop singer Kesha and rapper Nicki Minaj, was leaked online on April 22, 2011.

"[41] The remix adds heavier bass during the beginning, and starts with Minaj rapping with intensity about a female hater, in lines such as "Told you they'd revive your career, but somebody lied/ I ain't talkin' poultry when I say this chicken's fried."

"[38] Wesley Case of The Baltimore Sun stated that while Spears sounds processed, "Minaj's larger-than-life performance matches the in-the-red party production" and Kesha "adds an extra layer of dirt-under-the-nails sheen."

In her 45-second evisceration, Nicki manages to squeeze in chicken noises and the words 'poultry', 'Epsom salt', and 'Ricki Lake'-- not to mention the immortal diss 'Sniff, sniff, criiiies/ I done slayed your entire fucking liiiiife.'

Sprinkle a little bit of Kesha, the song's co-writer, on the chorus, and you've got a three-headed diva Hydra that sums up the recent changing of the femme pop guard from airbrushed and perfect to (relatively) weird and chaotic.

Baba Kahn of the production team Culture Shock stated, "Our goal was to take Britney's smash hit single and give fans a total Desi adrenaline rush.

From the groundbreaking Bollywood-inspired remix of 'Me Against the Music' to her recent collaboration with Indian fashion designers Falguni and Shane Peacock on the 'Hold It Against Me' video, she has embraced the incredible sights and sounds of this vibrant community throughout her career.

"[48] Michigan band Salem released a slowed-down version of the song, and made a music video featuring seemingly underage strippers and military footage.

"[50] "Till the World Ends" sold 117,000 copies after its first three days of sales in the United States, debuting at number twenty on the Billboard Hot 100 on the week of March 19, 2011.

[52][53] On the issue dated March 17, 2011, "Till the World Ends" sold 158,000 downloads (up 36%), peaking at number five on the Hot Digital Songs chart.

[69] The music video for "Till the World Ends" was directed by Ray Kay and filmed inside a basement in Los Angeles, California.

"[74] The video begins with the words "December 21st, 2012" flashing on screen, the day that refers to the fulfillment of the Great Cycle, Baktun in the Mayan calendar.

"[76] Jocelyn Vena of MTV also highlighted the comparisons to "I'm a Slave 4 U", explaining that "the director's cut of the video is a sexy mash-up of Spears doing what she does best: groping half-naked guys, giving the camera bedroom eyes and being sassy in a number of leather jackets and skintight bodysuits.

"[78] Tanner Stransky of Entertainment Weekly said it "is exactly what you’d expect for this song, and from Britney at this point in her career", and also complimented Spears for getting rid of the product placement in the "Hold It Against Me" video.

[79] Wesley Case of The Baltimore Sun stated that video "is typical 2011 party-starter — sweaty bodies, futuristic DJ-gear, well-timed faulty sprinkler system — but it captures the track's raging mood perfectly.

[87] Leah Collins of Dose commented, "sorry, Team Britney, but if any of you were hoping to pass off Spears’ anemic performance in the original as the result of unfortunate editing, this clip isn't exactly going to bring anyone back on side.