General fact: 21114 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 21114 is an unremarkable number.
Trivia: 21114 is an unremarkable number.
Historical date: October 21st is the day in 1931 that the Sakurakai, a secret society in the Imperial Japanese Army, launches an abortive coup d'état attempt.