16372068921 has 16 divisors (see below), whose sum is σ = 26120680320. Its totient is φ = 10075119120.

The previous prime is 16372068917. The next prime is 16372068931. The reversal of 16372068921 is 12986027361.

16372068921 is a `hidden beast` number, since 1 + 637 + 2 + 0 + 6 + 8 + 9 + 2 + 1 = 666.

It is not a de Polignac number, because 16372068921 - 2² = 16372068917 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (16372068901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23321685 + ... + 23322386.

It is an arithmetic number, because the mean of its divisors is an integer number (1632542520).

Almost surely, 2^16372068921 is an apocalyptic number.

It is an amenable number.

16372068921 is a deficient number, since it is larger than the sum of its proper divisors (9748611399).

16372068921 is a wasteful number, since it uses less digits than its factorization.

16372068921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46644093 (or 46644087 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 16372068921 in words is "sixteen billion, three hundred seventy-two million, sixty-eight thousand, nine hundred twenty-one".