General fact: 21892 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 21892 is an unremarkable number.
Trivia: 21892 is an uninteresting number.
Historical date: December 8th is the day in 1991 that the leaders of Russia, Belarus and Ukraine sign an agreement dissolving the Soviet Union and establishing the Commonwealth of Independent States.