Fatto generale: 1211 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1211 is the smallest number that ends an arithmetic progression of 9 numbers with the same prime signature.
Trivia: 1211 is an uninteresting number.
Data storica: April 25th is the day in 1707 that the Habsburg army is defeated by Bourbon army at Almansa (Spain) in the War of the Spanish Succession.