Fatto generale: 16213 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 16213 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 16213 is a boring number.
Data storica: May 21st is the day in 1946 that Physicist Louis Slotin is fatally irradiated in a criticality incident during an experiment with the Demon core at Los Alamos National Laboratory.