21031852672 has 48 divisors (see below), whose sum is σ = 42047599230. Its totient is φ = 10478853120.

The previous prime is 21031852663. The next prime is 21031852711. The reversal of 21031852672 is 27625813012.

It can be written as a sum of positive squares in 3 ways, for example, as 20812101696 + 219750976 = 144264^2 + 14824^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17807922 + ... + 17809102.

Almost surely, 2^21031852672 is an apocalyptic number.

It is an amenable number.

21031852672 is a deficient number, since it is larger than the sum of its proper divisors (21015746558).

21031852672 is an frugal number, since it uses more digits than its factorization.

21031852672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1941 (or 1556 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 21031852672 in words is "twenty-one billion, thirty-one million, eight hundred fifty-two thousand, six hundred seventy-two".