Fatto generale: 11221 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 11221 is a boring number.
Trivia: 11221 is an uninteresting number.
Data storica: September 20th is the day in 1881 that Chester A. Arthur is inaugurated as the 21st President of the United States following the assassination of James Garfield.