9921568472 has 32 divisors (see below), whose sum is σ = 18752916000. Its totient is φ = 4920943104.

The previous prime is 9921568469. The next prime is 9921568477. The reversal of 9921568472 is 2748651299.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921568477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 527258 + ... + 545750.

It is an arithmetic number, because the mean of its divisors is an integer number (586028625).

Almost surely, 2^9921568472 is an apocalyptic number.

It is an amenable number.

9921568472 is a deficient number, since it is larger than the sum of its proper divisors (8831347528).

9921568472 is a wasteful number, since it uses less digits than its factorization.

9921568472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19035 (or 19031 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 53.

The square root of 9921568472 is about 99607.0703916143. The cubic root of 9921568472 is about 2148.7873798013.

The spelling of 9921568472 in words is "nine billion, nine hundred twenty-one million, five hundred sixty-eight thousand, four hundred seventy-two".