Fatto generale: 21740 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 21740 is a boring number.
Trivia: 21740 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: July 9th is the day in 1850 that U.S. President Zachary Taylor dies and Millard Fillmore becomes the 13th President of the United States.