1216252249812 has 36 divisors (see below), whose sum is σ = 3111456566400. Its totient is φ = 400532868432.

The previous prime is 1216252249781. The next prime is 1216252249829. The reversal of 1216252249812 is 2189422526121.

1216252249812 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 2 + 522 + 49 + 81 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203519812 + ... + 203525787.

Almost surely, 2^{1216252249812} is an apocalyptic number.

1216252249812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1216252249812 is an abundant number, since it is smaller than the sum of its proper divisors (1895204316588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216252249812 is a wasteful number, since it uses less digits than its factorization.

1216252249812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407045692 (or 407045687 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The spelling of 1216252249812 in words is "one trillion, two hundred sixteen billion, two hundred fifty-two million, two hundred forty-nine thousand, eight hundred twelve".