Fatto matematico: 9217 is the total number of digits of all binary numbers of length 1-10.
Trivia: 9217 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: March 26th is the day in 1991 that Argentina, Brazil, Uruguay and Paraguay sign the Treaty of Asunción, establishing Mercosur, the South Common Market.