21557875512 has 64 divisors (see below), whose sum is σ = 55241078400. Its totient is φ = 7008566400.

The previous prime is 21557875501. The next prime is 21557875517.

21557875512 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21557875517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96039 + ... + 228777.

It is an arithmetic number, because the mean of its divisors is an integer number (863141850).

Almost surely, 2^21557875512 is an apocalyptic number.

It is an amenable number.

21557875512 is an abundant number, since it is smaller than the sum of its proper divisors (33683202888).

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

21557875512 is a wasteful number, since it uses less digits than its factorization.

21557875512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132916 (or 132912 counting only the distinct ones).

The product of its digits is 980000, while the sum is 48.

The spelling of 21557875512 in words is "twenty-one billion, five hundred fifty-seven million, eight hundred seventy-five thousand, five hundred twelve".