21604006217628 has 36 divisors (see below), whose sum is σ = 54727065043560. Its totient is φ = 7185914981856.

The previous prime is 21604006217609. The next prime is 21604006217653. The reversal of 21604006217628 is 82671260040612.

21604006217628 is a `hidden beast` number, since 2 + 1 + 6 + 0 + 4 + 0 + 0 + 6 + 2 + 17 + 628 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 642500623 + ... + 642534246.

It is an arithmetic number, because the mean of its divisors is an integer number (1520196251210).

Almost surely, 2^{21604006217628} is an apocalyptic number.

It is an amenable number.

21604006217628 is an abundant number, since it is smaller than the sum of its proper divisors (33123058825932).

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

21604006217628 is a wasteful number, since it uses less digits than its factorization.

21604006217628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285035346 (or 1285035341 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 21604006217628 in words is "twenty-one trillion, six hundred four billion, six million, two hundred seventeen thousand, six hundred twenty-eight".