99231321 has 24 divisors (see below), whose sum is σ = 155114784. Its totient is φ = 56259840.

The previous prime is 99231313. The next prime is 99231331. The reversal of 99231321 is 12313299.

99231321 = 1399² + 1400² + ... + 1447².

It is a happy number.

It is not a de Polignac number, because 99231321 - 2³ = 99231313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99231331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16681 + ... + 21833.

It is an arithmetic number, because the mean of its divisors is an integer number (6463116).

Almost surely, 2^99231321 is an apocalyptic number.

It is an amenable number.

99231321 is a deficient number, since it is larger than the sum of its proper divisors (55883463).

99231321 is a wasteful number, since it uses less digits than its factorization.

99231321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5301 (or 5294 counting only the distinct ones).

The product of its digits is 2916, while the sum is 30.

The square root of 99231321 is about 9961.4919063361. The cubic root of 99231321 is about 462.9665257004.

The spelling of 99231321 in words is "ninety-nine million, two hundred thirty-one thousand, three hundred twenty-one".