21590895900079 has 12 divisors (see below), whose sum is σ = 23733259993912. Its totient is φ = 19627162338960.

The previous prime is 21590895900031. The next prime is 21590895900089. The reversal of 21590895900079 is 97000959809512.

It is a de Polignac number, because none of the positive numbers 2^k-21590895900079 is a prime.

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21590895900089) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1618677 + ... + 6767710.

Almost surely, 2^{21590895900079} is an apocalyptic number.

21590895900079 is a deficient number, since it is larger than the sum of its proper divisors (2142364093833).

21590895900079 is a wasteful number, since it uses less digits than its factorization.

21590895900079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8407686 (or 8407675 counting only the distinct ones).

The product of its (nonzero) digits is 18370800, while the sum is 64.

The spelling of 21590895900079 in words is "twenty-one trillion, five hundred ninety billion, eight hundred ninety-five million, nine hundred thousand, seventy-nine".