[1] The song was written by Reyes, Derulo, Ghetto, Nicole Zignago, Ricardo Montaner, Jon Leone and Charlie Guerrero.

[2] While talking about the song, Sofía Reyes said; "I have been very anxious about this single and can't wait for my SoCrew to listen to it.

"1, 2, 3" is a unique blend of three very different genres and vibes (Latin, pop and urban) which brings a new style to my portfolio but still maintains my essence.

[2]The music video for the song, directed by Mike Ho, was shot in Los Angeles.

It premiered via Reyes' YouTube channel on February 16, 2018, and received a nomination for a Lo Nuestro Award for Video of the Year.