99032721 has 4 divisors (see below), whose sum is σ = 132043632. Its totient is φ = 66021812.

The previous prime is 99032711. The next prime is 99032723. The reversal of 99032721 is 12723099.

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 not a de Polignac number, because 99032721 - 2¹⁰ = 99031697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99032723) 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, 16505451 + ... + 16505456.

It is an arithmetic number, because the mean of its divisors is an integer number (33010908).

Almost surely, 2^99032721 is an apocalyptic number.

It is an amenable number.

99032721 is a deficient number, since it is larger than the sum of its proper divisors (33010911).

99032721 is a wasteful number, since it uses less digits than its factorization.

99032721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33010910.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 99032721 is about 9951.5185273404. The cubic root of 99032721 is about 462.6574614569.

The spelling of 99032721 in words is "ninety-nine million, thirty-two thousand, seven hundred twenty-one".