21556711122912 has 192 divisors, whose sum is σ = 72553334031360. Its totient is φ = 6099263442432.

The previous prime is 21556711122911. The next prime is 21556711122941. The reversal of 21556711122912 is 21922111765512.

21556711122912 is a `hidden beast` number, since 2 + 1 + 556 + 7 + 1 + 1 + 1 + 2 + 2 + 91 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21556711122911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16679343 + ... + 17925230.

It is an arithmetic number, because the mean of its divisors is an integer number (377881948080).

Almost surely, 2^{21556711122912} is an apocalyptic number.

It is an amenable number.

21556711122912 is an abundant number, since it is smaller than the sum of its proper divisors (50996622908448).

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

21556711122912 is a wasteful number, since it uses less digits than its factorization.

21556711122912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34604702 (or 34604688 counting only the distinct ones).

The product of its digits is 151200, while the sum is 45.

The spelling of 21556711122912 in words is "twenty-one trillion, five hundred fifty-six billion, seven hundred eleven million, one hundred twenty-two thousand, nine hundred twelve".