21555522555512 has 16 divisors (see below), whose sum is σ = 44090841591000. Its totient is φ = 9797964797920.

The previous prime is 21555522555499. The next prime is 21555522555517.

21555522555512 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 (21555522555517) 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 3 ways as a sum of consecutive naturals, for example, 122474559887 + ... + 122474560062.

Almost surely, 2^{21555522555512} is an apocalyptic number.

21555522555512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21555522555512 is an abundant number, since it is smaller than the sum of its proper divisors (22535319035488).

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

21555522555512 is a wasteful number, since it uses less digits than its factorization.

21555522555512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244949119966 (or 244949119962 counting only the distinct ones).

The product of its digits is 6250000, while the sum is 50.

The spelling of 21555522555512 in words is "twenty-one trillion, five hundred fifty-five billion, five hundred twenty-two million, five hundred fifty-five thousand, five hundred twelve".