20315636525021 has 32 divisors (see below), whose sum is σ = 20984568422400. Its totient is φ = 19653449256000.

The previous prime is 20315636524973. The next prime is 20315636525059. The reversal of 20315636525021 is 12052563651302.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20315636525021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20315636525021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315636528021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7571983946 + ... + 7571986628.

It is an arithmetic number, because the mean of its divisors is an integer number (655767763200).

Almost surely, 2^{20315636525021} is an apocalyptic number.

It is an amenable number.

20315636525021 is a deficient number, since it is larger than the sum of its proper divisors (668931897379).

20315636525021 is a wasteful number, since it uses less digits than its factorization.

20315636525021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4569.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 20315636525021 in words is "twenty trillion, three hundred fifteen billion, six hundred thirty-six million, five hundred twenty-five thousand, twenty-one".