9921200372 has 24 divisors (see below), whose sum is σ = 17413267872. Its totient is φ = 4946004000.

The previous prime is 9921200371. The next prime is 9921200389. The reversal of 9921200372 is 2730021299.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921200371) 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, 2398418 + ... + 2402550.

It is an arithmetic number, because the mean of its divisors is an integer number (725552828).

Almost surely, 2^9921200372 is an apocalyptic number.

It is an amenable number.

9921200372 is a deficient number, since it is larger than the sum of its proper divisors (7492067500).

9921200372 is a wasteful number, since it uses less digits than its factorization.

9921200372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5759 (or 5757 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 9921200372 is about 99605.2226140778. Note that the first 3 decimals coincide. The cubic root of 9921200372 is about 2148.7608054272.

The spelling of 9921200372 in words is "nine billion, nine hundred twenty-one million, two hundred thousand, three hundred seventy-two".