Fatto matematico: 21275 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 21275 is an unremarkable number.
Data storica: March 31st is the day in 2004 that Iraq War in Anbar Province - In Fallujah, Iraq, 4 American private military contractors working for Blackwater USA, are killed after being ambushed.