1216214256 has 20 divisors (see below), whose sum is σ = 3141886952. Its totient is φ = 405404736.

The previous prime is 1216214239. The next prime is 1216214269. The reversal of 1216214256 is 6524126121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12668851 + ... + 12668946.

Almost surely, 2^1216214256 is an apocalyptic number.

1216214256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1216214256 is an abundant number, since it is smaller than the sum of its proper divisors (1925672696).

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

1216214256 is a wasteful number, since it uses less digits than its factorization.

1216214256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25337808 (or 25337802 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 1216214256 is about 34874.2635191053. The cubic root of 1216214256 is about 1067.4233445204.

The spelling of 1216214256 in words is "one billion, two hundred sixteen million, two hundred fourteen thousand, two hundred fifty-six".