21136185853503 has 32 divisors (see below), whose sum is σ = 32509206558720. Its totient is φ = 11964693243360.

The previous prime is 21136185853499. The next prime is 21136185853511. The reversal of 21136185853503 is 30535858163112.

It is not a de Polignac number, because 21136185853503 - 2² = 21136185853499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21136185853513) 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, 183322288 + ... + 183437546.

It is an arithmetic number, because the mean of its divisors is an integer number (1015912704960).

Almost surely, 2^{21136185853503} is an apocalyptic number.

21136185853503 is a deficient number, since it is larger than the sum of its proper divisors (11373020705217).

21136185853503 is a wasteful number, since it uses less digits than its factorization.

21136185853503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196987.

The product of its (nonzero) digits is 2592000, while the sum is 51.

The spelling of 21136185853503 in words is "twenty-one trillion, one hundred thirty-six billion, one hundred eighty-five million, eight hundred fifty-three thousand, five hundred three".