21352568510 has 64 divisors (see below), whose sum is σ = 47549642112. Its totient is φ = 6722666496.

The previous prime is 21352568509. The next prime is 21352568533. The reversal of 21352568510 is 1586525312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114842 + ... + 236418.

It is an arithmetic number, because the mean of its divisors is an integer number (742963158).

Almost surely, 2^21352568510 is an apocalyptic number.

21352568510 is an abundant number, since it is smaller than the sum of its proper divisors (26197073602).

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

21352568510 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 9 representation: 21352568510 = (61102555382)₉.

21352568510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121797.

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 21352568510 in words is "twenty-one billion, three hundred fifty-two million, five hundred sixty-eight thousand, five hundred ten".