21255232410 has 64 divisors (see below), whose sum is σ = 56697528960. Its totient is φ = 5666371200.

The previous prime is 21255232409. The next prime is 21255232477. The reversal of 21255232410 is 1423255212.

21255232410 is a `hidden beast` number, since 2 + 12 + 5 + 5 + 232 + 410 = 666.

It is a super-2 number, since 2×21255232410² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1084054 + ... + 1103486.

It is an arithmetic number, because the mean of its divisors is an integer number (885898890).

Almost surely, 2^21255232410 is an apocalyptic number.

21255232410 is an abundant number, since it is smaller than the sum of its proper divisors (35442296550).

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

21255232410 is a wasteful number, since it uses less digits than its factorization.

21255232410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23500 (or 23494 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21255232410 its reverse (1423255212), we get a palindrome (22678487622).

The spelling of 21255232410 in words is "twenty-one billion, two hundred fifty-five million, two hundred thirty-two thousand, four hundred ten".