99921175 has 12 divisors (see below), whose sum is σ = 125473120. Its totient is φ = 78923520.

The previous prime is 99921169. The next prime is 99921179. The reversal of 99921175 is 57112999.

It is not a de Polignac number, because 99921175 - 2⁷ = 99921047 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99921179) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23322 + ... + 27271.

Almost surely, 2^99921175 is an apocalyptic number.

99921175 is a deficient number, since it is larger than the sum of its proper divisors (25551945).

99921175 is a wasteful number, since it uses less digits than its factorization.

99921175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50682 (or 50677 counting only the distinct ones).

The product of its digits is 51030, while the sum is 43.

The square root of 99921175 is about 9996.0579730212. The cubic root of 99921175 is about 464.0368935562.

The spelling of 99921175 in words is "ninety-nine million, nine hundred twenty-one thousand, one hundred seventy-five".