1216304401512 has 64 divisors (see below), whose sum is σ = 3219876204480. Its totient is φ = 381556431872.

The previous prime is 1216304401511. The next prime is 1216304401531. The reversal of 1216304401512 is 2151044036121.

It is a super-2 number, since 2×1216304401512² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1216304401512.

It is not an unprimeable number, because it can be changed into a prime (1216304401511) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5556898 + ... + 5771630.

It is an arithmetic number, because the mean of its divisors is an integer number (50310565695).

Almost surely, 2^{1216304401512} is an apocalyptic number.

1216304401512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1216304401512 is an abundant number, since it is smaller than the sum of its proper divisors (2003571802968).

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

1216304401512 is a wasteful number, since it uses less digits than its factorization.

1216304401512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228642 (or 228638 counting only the distinct ones).

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

Adding to 1216304401512 its reverse (2151044036121), we get a palindrome (3367348437633).

The spelling of 1216304401512 in words is "one trillion, two hundred sixteen billion, three hundred four million, four hundred one thousand, five hundred twelve".