21655044202604 has 24 divisors (see below), whose sum is σ = 38704966594560. Its totient is φ = 10596510109136.

The previous prime is 21655044202523. The next prime is 21655044202643. The reversal of 21655044202604 is 40620244055612.

It is a super-2 number, since 2×21655044202604² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341132 + ... + 6589875.

It is an arithmetic number, because the mean of its divisors is an integer number (1612706941440).

Almost surely, 2^{21655044202604} is an apocalyptic number.

It is an amenable number.

21655044202604 is a deficient number, since it is larger than the sum of its proper divisors (17049922391956).

21655044202604 is a wasteful number, since it uses less digits than its factorization.

21655044202604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6947677 (or 6947675 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 41.

The spelling of 21655044202604 in words is "twenty-one trillion, six hundred fifty-five billion, forty-four million, two hundred two thousand, six hundred four".