221112011220156 has 72 divisors (see below), whose sum is σ = 638770402058880. Its totient is φ = 63174625988256.

The previous prime is 221112011220071. The next prime is 221112011220157. The reversal of 221112011220156 is 651022110211122.

221112011220156 is a `hidden beast` number, since 221 + 1 + 1 + 201 + 1 + 220 + 15 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221112011220157) 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 23 ways as a sum of consecutive naturals, for example, 73260715 + ... + 76219133.

Almost surely, 2^{221112011220156} is an apocalyptic number.

It is an amenable number.

221112011220156 is an abundant number, since it is smaller than the sum of its proper divisors (417658390838724).

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

221112011220156 is a wasteful number, since it uses less digits than its factorization.

221112011220156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3255023 (or 3255018 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

Adding to 221112011220156 its reverse (651022110211122), we get a palindrome (872134121431278).

The spelling of 221112011220156 in words is "two hundred twenty-one trillion, one hundred twelve billion, eleven million, two hundred twenty thousand, one hundred fifty-six".