General fact: 21662 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 21662 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 21662 is an uninteresting number.
Historical date: April 22nd is the day in 1906 that the 1906 Summer Olympics, not now recognized as part of the official Olympic Games, open in Athens.