21604684773108 has 24 divisors (see below), whose sum is σ = 50413338318112. Its totient is φ = 7201217708064.

The previous prime is 21604684773083. The next prime is 21604684773181. The reversal of 21604684773108 is 80137748640612.

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, 42723535 + ... + 43226262.

Almost surely, 2^{21604684773108} is an apocalyptic number.

It is an amenable number.

21604684773108 is an abundant number, since it is smaller than the sum of its proper divisors (28808653545004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21604684773108 is a wasteful number, since it uses less digits than its factorization.

21604684773108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85970751 (or 85970749 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 57.

The spelling of 21604684773108 in words is "twenty-one trillion, six hundred four billion, six hundred eighty-four million, seven hundred seventy-three thousand, one hundred eight".