21519122504 has 16 divisors (see below), whose sum is σ = 44016387120. Its totient is φ = 9781419280.

The previous prime is 21519122489. The next prime is 21519122567. The reversal of 21519122504 is 40522191512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122267654 + ... + 122267829.

It is an arithmetic number, because the mean of its divisors is an integer number (2751024195).

Almost surely, 2^21519122504 is an apocalyptic number.

It is an amenable number.

21519122504 is an abundant number, since it is smaller than the sum of its proper divisors (22497264616).

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

21519122504 is a wasteful number, since it uses less digits than its factorization.

21519122504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244535500 (or 244535496 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The spelling of 21519122504 in words is "twenty-one billion, five hundred nineteen million, one hundred twenty-two thousand, five hundred four".