21604265636006 has 16 divisors (see below), whose sum is σ = 33096193850880. Its totient is φ = 10572205151880.

The previous prime is 21604265635943. The next prime is 21604265636033. The reversal of 21604265636006 is 60063656240612.

It is a happy number.

It is a super-2 number, since 2×21604265636006² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

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, 10113941 + ... + 12062351.

It is an arithmetic number, because the mean of its divisors is an integer number (2068512115680).

Almost surely, 2^{21604265636006} is an apocalyptic number.

21604265636006 is a deficient number, since it is larger than the sum of its proper divisors (11491928214874).

21604265636006 is a wasteful number, since it uses less digits than its factorization.

21604265636006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066419.

The product of its (nonzero) digits is 1866240, while the sum is 47.

The spelling of 21604265636006 in words is "twenty-one trillion, six hundred four billion, two hundred sixty-five million, six hundred thirty-six thousand, six".