Fatto generale: 17211 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 17211 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 17211 is a boring number.
Data storica: February 13th is the day in 1961 that a 500,000-year-old rock is discovered near Olancha, California, US, that appears to anachronistically encase a spark plug.