Fatto generale: 21833 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 21833 is a boring number.
Trivia: 21833 is an uninteresting number.
Data storica: October 10th is the day in 1973 that Vice President of the United States Spiro Agnew resigns after being charged with federal income tax evasion.