General fact: 28211 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 28211 is a boring number.
Trivia: 28211 is an unremarkable number.
Historical date: March 27th is the day in 1986 that a car bomb explodes at Russell Street Police HQ in Melbourne, killing 1 police officer and injuring 21 people.