21655363111604 has 48 divisors (see below), whose sum is σ = 38475392014080. Its totient is φ = 10662863178240.

The previous prime is 21655363111597. The next prime is 21655363111621. The reversal of 21655363111604 is 40611136355612.

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, 636549707 + ... + 636583725.

It is an arithmetic number, because the mean of its divisors is an integer number (801570666960).

Almost surely, 2^{21655363111604} is an apocalyptic number.

It is an amenable number.

21655363111604 is a deficient number, since it is larger than the sum of its proper divisors (16820028902476).

21655363111604 is a wasteful number, since it uses less digits than its factorization.

21655363111604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37400 (or 37398 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 21655363111604 in words is "twenty-one trillion, six hundred fifty-five billion, three hundred sixty-three million, one hundred eleven thousand, six hundred four".