21115515624522 has 16 divisors (see below), whose sum is σ = 46070215908192. Its totient is φ = 6398641098320.

The previous prime is 21115515624521. The next prime is 21115515624661. The reversal of 21115515624522 is 22542651551112.

It is not an unprimeable number, because it can be changed into a prime (21115515624521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159966027393 + ... + 159966027524.

It is an arithmetic number, because the mean of its divisors is an integer number (2879388494262).

Almost surely, 2^{21115515624522} is an apocalyptic number.

21115515624522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21115515624522 is an abundant number, since it is smaller than the sum of its proper divisors (24954700283670).

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

21115515624522 is a wasteful number, since it uses less digits than its factorization.

21115515624522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319932054933.

The product of its digits is 240000, while the sum is 42.

The spelling of 21115515624522 in words is "twenty-one trillion, one hundred fifteen billion, five hundred fifteen million, six hundred twenty-four thousand, five hundred twenty-two".