21604073172267 has 16 divisors (see below), whose sum is σ = 31094318211840. Its totient is φ = 13301458343712.

The previous prime is 21604073172259. The next prime is 21604073172281. The reversal of 21604073172267 is 76227137040612.

It is not a de Polignac number, because 21604073172267 - 2³ = 21604073172259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21604073172217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5398317133 + ... + 5398321134.

It is an arithmetic number, because the mean of its divisors is an integer number (1943394888240).

Almost surely, 2^{21604073172267} is an apocalyptic number.

21604073172267 is a deficient number, since it is larger than the sum of its proper divisors (9490245039573).

21604073172267 is a wasteful number, since it uses less digits than its factorization.

21604073172267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10796638322.

The product of its (nonzero) digits is 1185408, while the sum is 48.

The spelling of 21604073172267 in words is "twenty-one trillion, six hundred four billion, seventy-three million, one hundred seventy-two thousand, two hundred sixty-seven".