21315053552 has 20 divisors (see below), whose sum is σ = 44474679480. Its totient is φ = 9837716928.

The previous prime is 21315053533. The next prime is 21315053567. The reversal of 21315053552 is 25535051312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51237902 + ... + 51238317.

It is an arithmetic number, because the mean of its divisors is an integer number (2223733974).

Almost surely, 2^21315053552 is an apocalyptic number.

It is an amenable number.

21315053552 is an abundant number, since it is smaller than the sum of its proper divisors (23159625928).

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

21315053552 is a wasteful number, since it uses less digits than its factorization.

21315053552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102476240 (or 102476234 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 32.

The spelling of 21315053552 in words is "twenty-one billion, three hundred fifteen million, fifty-three thousand, five hundred fifty-two".