99399321 has 12 divisors (see below), whose sum is σ = 164087872. Its totient is φ = 56799576.

The previous prime is 99399319. The next prime is 99399329. The reversal of 99399321 is 12399399.

It is not a de Polignac number, because 99399321 - 2¹ = 99399319 is a prime.

It is a super-2 number, since 2×99399321² = 19760450030522082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99399329) 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, 788821 + ... + 788946.

Almost surely, 2^99399321 is an apocalyptic number.

It is an amenable number.

99399321 is a deficient number, since it is larger than the sum of its proper divisors (64688551).

99399321 is a wasteful number, since it uses less digits than its factorization.

99399321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577780 (or 1577777 counting only the distinct ones).

The product of its digits is 118098, while the sum is 45.

The square root of 99399321 is about 9969.9208121228. The cubic root of 99399321 is about 463.2276479734.

The spelling of 99399321 in words is "ninety-nine million, three hundred ninety-nine thousand, three hundred twenty-one".