Fatto generale: 21766 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 21766 is an uninteresting number.
Trivia: 21766 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: August 4th is the day in 1975 that the Japanese Red Army takes more than 50 hostages at the AIA Building housing several embassies in Kuala Lumpur, Malaysia.