Fatto generale: 21863 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 21863 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 21863 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: November 9th is the day in 1935 that the Congress of Industrial Organizations is founded in Atlantic City, New Jersey by eight trade unions belonging to the American Federation of Labor.