Fatto generale: 21397 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 21397 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 21397 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: July 31st is the day in 1992 that Thai Airways International Flight 311 crashes into a mountain north of Kathmandu, Nepal killing all 113 people on board.