1216224012 has 12 divisors (see below), whose sum is σ = 2837856056. Its totient is φ = 405408000.

The previous prime is 1216223993. The next prime is 1216224017. The reversal of 1216224012 is 2104226121.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1216224012² = 2958401694730752288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1216224012.

It is not an unprimeable number, because it can be changed into a prime (1216224017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50675989 + ... + 50676012.

Almost surely, 2^1216224012 is an apocalyptic number.

1216224012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1216224012 is an abundant number, since it is smaller than the sum of its proper divisors (1621632044).

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

1216224012 is a wasteful number, since it uses less digits than its factorization.

1216224012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101352008 (or 101352006 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1216224012 is about 34874.4033927464. The cubic root of 1216224012 is about 1067.4261986651.

The spelling of 1216224012 in words is "one billion, two hundred sixteen million, two hundred twenty-four thousand, twelve".