21536204253536 has 48 divisors (see below), whose sum is σ = 48473152890624. Its totient is φ = 9226622143104.

The previous prime is 21536204253523. The next prime is 21536204253563. The reversal of 21536204253536 is 63535240263512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15909110 + ... + 17209653.

It is an arithmetic number, because the mean of its divisors is an integer number (1009857351888).

Almost surely, 2^{21536204253536} is an apocalyptic number.

It is an amenable number.

21536204253536 is an abundant number, since it is smaller than the sum of its proper divisors (26936948637088).

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

21536204253536 is a wasteful number, since it uses less digits than its factorization.

21536204253536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33121683 (or 33121675 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 47.

The spelling of 21536204253536 in words is "twenty-one trillion, five hundred thirty-six billion, two hundred four million, two hundred fifty-three thousand, five hundred thirty-six".