99599321 has 4 divisors (see below), whose sum is σ = 99632100. Its totient is φ = 99566544.

The previous prime is 99599317. The next prime is 99599323. The reversal of 99599321 is 12399599.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12399599 = 23 ⋅539113.

It can be written as a sum of positive squares in 2 ways, for example, as 68641225 + 30958096 = 8285^2 + 5564^2 .

It is a cyclic number.

It is not a de Polignac number, because 99599321 - 2² = 99599317 is a prime.

It is a super-2 number, since 2×99599321² = 19840049487322082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99599323) 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, 11306 + ... + 18083.

It is an arithmetic number, because the mean of its divisors is an integer number (24908025).

Almost surely, 2^99599321 is an apocalyptic number.

It is an amenable number.

99599321 is a deficient number, since it is larger than the sum of its proper divisors (32779).

99599321 is a wasteful number, since it uses less digits than its factorization.

99599321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32778.

The product of its digits is 196830, while the sum is 47.

The square root of 99599321 is about 9979.9459417374. The cubic root of 99599321 is about 463.5381244807.

The spelling of 99599321 in words is "ninety-nine million, five hundred ninety-nine thousand, three hundred twenty-one".