21373611664060 has 48 divisors (see below), whose sum is σ = 46591044232320. Its totient is φ = 8230368752640.

The previous prime is 21373611663997. The next prime is 21373611664087. The reversal of 21373611664060 is 6046611637312.

It is a self number, because there is not a number n which added to its sum of digits gives 21373611664060.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186318765 + ... + 186433444.

It is an arithmetic number, because the mean of its divisors is an integer number (970646754840).

Almost surely, 2^{21373611664060} is an apocalyptic number.

21373611664060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21373611664060 is an abundant number, since it is smaller than the sum of its proper divisors (25217432568260).

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

21373611664060 is a wasteful number, since it uses less digits than its factorization.

21373611664060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372752326 (or 372752324 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 21373611664060 in words is "twenty-one trillion, three hundred seventy-three billion, six hundred eleven million, six hundred sixty-four thousand, sixty".