Hecho general: 21670 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 21670 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 21670 is a boring number.
Fecha histórica: April 30th is the day in 1927 that the Federal Industrial Institute for Women opens in Alderson, West Virginia, as the first women's federal prison in the United States.