General fact: 21485 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 21485 is an unremarkable number.
Trivia: 21485 is an uninteresting number.
Historical date: October 27th is the day in 1967 that Catholic priest Philip Berrigan and others of the Baltimore Four protest the Vietnam War by pouring blood on Selective Service records.