21604154634 has 24 divisors (see below), whose sum is σ = 48318970752. Its totient is φ = 6969081960.

The previous prime is 21604154629. The next prime is 21604154651. The reversal of 21604154634 is 43645140612.

21604154634 is a `hidden beast` number, since 2 + 1 + 6 + 0 + 4 + 15 + 4 + 634 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19358004 + ... + 19359119.

It is an arithmetic number, because the mean of its divisors is an integer number (2013290448).

Almost surely, 2^21604154634 is an apocalyptic number.

21604154634 is an abundant number, since it is smaller than the sum of its proper divisors (26714816118).

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

21604154634 is a wasteful number, since it uses less digits than its factorization.

21604154634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38717162 (or 38717159 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 21604154634 in words is "twenty-one billion, six hundred four million, one hundred fifty-four thousand, six hundred thirty-four".