He made his debut in Kaivantha Kalai (2006) directed by his father Pandiarajan and the film opened to average reviews from critics.
A critic noted Prithvi Rajan "makes his debut, does a convincing job and has his father's mannerisms.
[3] During the making of Padhinettan Kudi Ellai Arambam, he was injured in a fire accident and suffered burn injuries.
[5] His elder brother Pallavarajan had once announced a project starring Prithvi titled Eliyum Poonaiyum which never took off, while his younger brother Prem Rajan, is in the cast list of Prithvi's film Varatti.
He took part in the Celebrity Cricket League representing the Chennai Rhinos, winning acclaim for his performances in the field.