99392921 has 4 divisors (see below), whose sum is σ = 101507712. Its totient is φ = 97278132.

The previous prime is 99392911. The next prime is 99392957. The reversal of 99392921 is 12929399.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99392921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99392911) 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, 1057325 + ... + 1057418.

It is an arithmetic number, because the mean of its divisors is an integer number (25376928).

Almost surely, 2^99392921 is an apocalyptic number.

It is an amenable number.

99392921 is a deficient number, since it is larger than the sum of its proper divisors (2114791).

99392921 is a wasteful number, since it uses less digits than its factorization.

99392921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114790.

The product of its digits is 78732, while the sum is 44.

The square root of 99392921 is about 9969.5998415182. The cubic root of 99392921 is about 463.2177058512.

The spelling of 99392921 in words is "ninety-nine million, three hundred ninety-two thousand, nine hundred twenty-one".