21356252010 has 48 divisors (see below), whose sum is σ = 56355021216. Its totient is φ = 5609998944.

The previous prime is 21356251991. The next prime is 21356252041. The reversal of 21356252010 is 1025265312.

It is a happy number.

21356252010 is a `hidden beast` number, since 2 + 1 + 3 + 5 + 625 + 20 + 10 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1764804 + ... + 1776863.

It is an arithmetic number, because the mean of its divisors is an integer number (1174062942).

Almost surely, 2^21356252010 is an apocalyptic number.

21356252010 is an abundant number, since it is smaller than the sum of its proper divisors (34998769206).

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

21356252010 is a wasteful number, since it uses less digits than its factorization.

21356252010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3541747 (or 3541744 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 21356252010 in words is "twenty-one billion, three hundred fifty-six million, two hundred fifty-two thousand, ten".