156221211111216 has 20 divisors (see below), whose sum is σ = 403571462037432. Its totient is φ = 52073737037056.

The previous prime is 156221211111211. The next prime is 156221211111223. The reversal of 156221211111216 is 612111112122651.

It is not an unprimeable number, because it can be changed into a prime (156221211111211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1627304282361 + ... + 1627304282456.

Almost surely, 2^{156221211111216} is an apocalyptic number.

156221211111216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

156221211111216 is an abundant number, since it is smaller than the sum of its proper divisors (247350250926216).

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

156221211111216 is a wasteful number, since it uses less digits than its factorization.

156221211111216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3254608564828 (or 3254608564822 counting only the distinct ones).

The product of its digits is 2880, while the sum is 33.

Adding to 156221211111216 its reverse (612111112122651), we get a palindrome (768332323233867).

The spelling of 156221211111216 in words is "one hundred fifty-six trillion, two hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, two hundred sixteen".