21120572688 has 20 divisors (see below), whose sum is σ = 54561479568. Its totient is φ = 7040190880.

The previous prime is 21120572677. The next prime is 21120572723. The reversal of 21120572688 is 88627502112.

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, 220005918 + ... + 220006013.

Almost surely, 2^21120572688 is an apocalyptic number.

It is an amenable number.

21120572688 is an abundant number, since it is smaller than the sum of its proper divisors (33440906880).

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

21120572688 is a wasteful number, since it uses less digits than its factorization.

21120572688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440011942 (or 440011936 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 42.

The spelling of 21120572688 in words is "twenty-one billion, one hundred twenty million, five hundred seventy-two thousand, six hundred eighty-eight".