21122515555504 has 40 divisors (see below), whose sum is σ = 44645893886160. Its totient is φ = 9601019366400.

The previous prime is 21122515555451. The next prime is 21122515555507. The reversal of 21122515555504 is 40555551522112.

It is not an unprimeable number, because it can be changed into a prime (21122515555507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13642684 + ... + 15111844.

It is an arithmetic number, because the mean of its divisors is an integer number (1116147347154).

Almost surely, 2^{21122515555504} is an apocalyptic number.

It is an amenable number.

21122515555504 is an abundant number, since it is smaller than the sum of its proper divisors (23523378330656).

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

21122515555504 is a wasteful number, since it uses less digits than its factorization.

21122515555504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550869 (or 1550863 counting only the distinct ones).

The product of its (nonzero) digits is 500000, while the sum is 43.

The spelling of 21122515555504 in words is "twenty-one trillion, one hundred twenty-two billion, five hundred fifteen million, five hundred fifty-five thousand, five hundred four".