Fatto generale: 21479 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 21479 is a boring number.
Trivia: 21479 is a boring number.
Data storica: October 21st is the day in 1959 that President Dwight D. Eisenhower signs an executive order transferring Wernher von Braun and other German scientists from the United States Army to NASA.