921207172 has 12 divisors (see below), whose sum is σ = 1696960720. Its totient is φ = 436361256.

The previous prime is 921207149. The next prime is 921207173. The reversal of 921207172 is 271702129.

It is a happy number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (921207173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6060498 + ... + 6060649.

Almost surely, 2^921207172 is an apocalyptic number.

It is an amenable number.

921207172 is a deficient number, since it is larger than the sum of its proper divisors (775753548).

921207172 is a wasteful number, since it uses less digits than its factorization.

921207172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12121170 (or 12121168 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 921207172 is about 30351.3948938101. The cubic root of 921207172 is about 973.0140323244.

The spelling of 921207172 in words is "nine hundred twenty-one million, two hundred seven thousand, one hundred seventy-two".