21104061664554 has 32 divisors (see below), whose sum is σ = 51161361612480. Its totient is φ = 6395170201200.

The previous prime is 21104061664547. The next prime is 21104061664573. The reversal of 21104061664554 is 45546616040112.

21104061664554 is a `hidden beast` number, since 21 + 1 + 0 + 4 + 0 + 6 + 16 + 64 + 554 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17764361077 + ... + 17764362264.

It is an arithmetic number, because the mean of its divisors is an integer number (1598792550390).

Almost surely, 2^{21104061664554} is an apocalyptic number.

21104061664554 is an abundant number, since it is smaller than the sum of its proper divisors (30057299947926).

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

21104061664554 is a wasteful number, since it uses less digits than its factorization.

21104061664554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35528723363 (or 35528723357 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 21104061664554 in words is "twenty-one trillion, one hundred four billion, sixty-one million, six hundred sixty-four thousand, five hundred fifty-four".