21507536443372 has 24 divisors (see below), whose sum is σ = 43207965602816. Its totient is φ = 9176181465168.

The previous prime is 21507536443241. The next prime is 21507536443397. The reversal of 21507536443372 is 27334463570512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1722250038 + ... + 1722262525.

Almost surely, 2^{21507536443372} is an apocalyptic number.

It is an amenable number.

21507536443372 is an abundant number, since it is smaller than the sum of its proper divisors (21700429159444).

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

21507536443372 is a wasteful number, since it uses less digits than its factorization.

21507536443372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444512797 (or 3444512795 counting only the distinct ones).

The product of its (nonzero) digits is 12700800, while the sum is 52.

The spelling of 21507536443372 in words is "twenty-one trillion, five hundred seven billion, five hundred thirty-six million, four hundred forty-three thousand, three hundred seventy-two".