99921306 has 8 divisors (see below), whose sum is σ = 199842624. Its totient is φ = 33307100.

The previous prime is 99921221. The next prime is 99921313. The reversal of 99921306 is 60312999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

99921306 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8326770 + ... + 8326781.

It is an arithmetic number, because the mean of its divisors is an integer number (24980328).

Almost surely, 2^99921306 is an apocalyptic number.

99921306 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99921306 is a wasteful number, since it uses less digits than its factorization.

99921306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16653556.

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 99921306 is about 9996.0645256021. The cubic root of 99921306 is about 464.0370963454.

The spelling of 99921306 in words is "ninety-nine million, nine hundred twenty-one thousand, three hundred six".