Fatto generale: 21245 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 21245 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 21245 is an unremarkable number.
Data storica: March 1st is the day in 1966 that Venera 3 Soviet space probe crashes on Venus becoming the first spacecraft to land on another planet's surface.