99921307 has 4 divisors (see below), whose sum is σ = 100020960. Its totient is φ = 99821656.

The previous prime is 99921221. The next prime is 99921313. The reversal of 99921307 is 70312999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70312999 = 151 ⋅465649.

It is a cyclic number.

It is not a de Polignac number, because 99921307 - 2⁷ = 99921179 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99921307.

It is not an unprimeable number, because it can be changed into a prime (99921347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48307 + ... + 50332.

It is an arithmetic number, because the mean of its divisors is an integer number (25005240).

Almost surely, 2^99921307 is an apocalyptic number.

99921307 is a deficient number, since it is larger than the sum of its proper divisors (99653).

99921307 is a wasteful number, since it uses less digits than its factorization.

99921307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99652.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 99921307 is about 9996.0645756217. The cubic root of 99921307 is about 464.0370978934.

The spelling of 99921307 in words is "ninety-nine million, nine hundred twenty-one thousand, three hundred seven".