Fatto matematico: 2143 is the number of commutative semigroups of order 6.
Trivia: 2143 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: November 12th is the day in 2011 that Silvio Berlusconi resigns as Prime Minister of Italy due, in large part, to the European sovereign debt crisis.