21008510543331 has 24 divisors (see below), whose sum is σ = 32310164137680. Its totient is φ = 13108169120256.

The previous prime is 21008510543323. The next prime is 21008510543359. The reversal of 21008510543331 is 13334501580012.

21008510543331 is a `hidden beast` number, since 2 + 1 + 0 + 0 + 85 + 1 + 0 + 543 + 3 + 31 = 666.

It is not a de Polignac number, because 21008510543331 - 2³ = 21008510543323 is a prime.

It is a super-2 number, since 2×21008510543331² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21008510545331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 383521570 + ... + 383576343.

It is an arithmetic number, because the mean of its divisors is an integer number (1346256839070).

Almost surely, 2^{21008510543331} is an apocalyptic number.

21008510543331 is a deficient number, since it is larger than the sum of its proper divisors (11301653594349).

21008510543331 is a wasteful number, since it uses less digits than its factorization.

21008510543331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767098115 (or 767098112 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 21008510543331 in words is "twenty-one trillion, eight billion, five hundred ten million, five hundred forty-three thousand, three hundred thirty-one".