21567852156 has 24 divisors (see below), whose sum is σ = 50687042560. Its totient is φ = 7137562032.

The previous prime is 21567852149. The next prime is 21567852197. The reversal of 21567852156 is 65125876512.

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 7 ways as a sum of consecutive naturals, for example, 6463516 + ... + 6466851.

Almost surely, 2^21567852156 is an apocalyptic number.

It is an amenable number.

21567852156 is an abundant number, since it is smaller than the sum of its proper divisors (29119190404).

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

21567852156 is a wasteful number, since it uses less digits than its factorization.

21567852156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12930513 (or 12930511 counting only the distinct ones).

The product of its digits is 1008000, while the sum is 48.

The spelling of 21567852156 in words is "twenty-one billion, five hundred sixty-seven million, eight hundred fifty-two thousand, one hundred fifty-six".