21604772006323 has 24 divisors (see below), whose sum is σ = 23769519216800. Its totient is φ = 19622410980480.

The previous prime is 21604772006317. The next prime is 21604772006353. The reversal of 21604772006323 is 32360027740612.

It is not a de Polignac number, because 21604772006323 - 2²¹ = 21604769909171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21604772006323.

It is not an unprimeable number, because it can be changed into a prime (21604772006353) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 670252615 + ... + 670284847.

Almost surely, 2^{21604772006323} is an apocalyptic number.

21604772006323 is a deficient number, since it is larger than the sum of its proper divisors (2164747210477).

21604772006323 is a wasteful number, since it uses less digits than its factorization.

21604772006323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37243 (or 37232 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 43.

Adding to 21604772006323 its reverse (32360027740612), we get a palindrome (53964799746935).

The spelling of 21604772006323 in words is "twenty-one trillion, six hundred four billion, seven hundred seventy-two million, six thousand, three hundred twenty-three".