21604314168 has 40 divisors (see below), whose sum is σ = 60512085480. Its totient is φ = 7201437840.

The previous prime is 21604314143. The next prime is 21604314181. The reversal of 21604314168 is 86141340612.

21604314168 is a `hidden beast` number, since 2 + 1 + 60 + 431 + 4 + 168 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 16669348 + ... + 16670643.

It is an arithmetic number, because the mean of its divisors is an integer number (1512802137).

Almost surely, 2^21604314168 is an apocalyptic number.

It is an amenable number.

21604314168 is an abundant number, since it is smaller than the sum of its proper divisors (38907771312).

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

21604314168 is a wasteful number, since it uses less digits than its factorization.

21604314168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33340009 (or 33339996 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 21604314168 in words is "twenty-one billion, six hundred four million, three hundred fourteen thousand, one hundred sixty-eight".