99957321 has 12 divisors (see below), whose sum is σ = 149730672. Its totient is φ = 66638052.

The previous prime is 99957317. The next prime is 99957337. The reversal of 99957321 is 12375999.

It is a happy number.

It is not a de Polignac number, because 99957321 - 2² = 99957317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99957371) 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, 205431 + ... + 205916.

It is an arithmetic number, because the mean of its divisors is an integer number (12477556).

Almost surely, 2^99957321 is an apocalyptic number.

It is an amenable number.

99957321 is a deficient number, since it is larger than the sum of its proper divisors (49773351).

99957321 is an equidigital number, since it uses as much as digits as its factorization.

99957321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411362 (or 411350 counting only the distinct ones).

The product of its digits is 153090, while the sum is 45.

The square root of 99957321 is about 9997.8658222643. The cubic root of 99957321 is about 464.0928411751.

The spelling of 99957321 in words is "ninety-nine million, nine hundred fifty-seven thousand, three hundred twenty-one".