Fatto generale: 21593 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 21593 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 21593 is an uninteresting number.
Data storica: February 12th is the day in 1974 that Aleksandr Solzhenitsyn, winner of the Nobel Prize in literature in 1970, is exiled from the Soviet Union.