Fatto generale: 21597 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 21597 is a boring number.
Trivia: 21597 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: February 16th is the day in 1987 that the trial of John Demjanjuk, accused of being a Nazi guard dubbed "Ivan the Terrible" in Treblinka extermination camp, starts in Jerusalem.