21603217770204 has 24 divisors (see below), whose sum is σ = 57608580720768. Its totient is φ = 6172347934320.

The previous prime is 21603217770163. The next prime is 21603217770263. The reversal of 21603217770204 is 40207771230612.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 7 ways as a sum of consecutive naturals, for example, 128590581882 + ... + 128590582049.

It is an arithmetic number, because the mean of its divisors is an integer number (2400357530032).

Almost surely, 2^{21603217770204} is an apocalyptic number.

It is an amenable number.

21603217770204 is an abundant number, since it is smaller than the sum of its proper divisors (36005362950564).

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

21603217770204 is a wasteful number, since it uses less digits than its factorization.

21603217770204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257181163945 (or 257181163943 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 42.

The spelling of 21603217770204 in words is "twenty-one trillion, six hundred three billion, two hundred seventeen million, seven hundred seventy thousand, two hundred four".