99921305 has 32 divisors (see below), whose sum is σ = 136055808. Its totient is φ = 69811200.

The previous prime is 99921221. The next prime is 99921313. The reversal of 99921305 is 50312999.

It is not a de Polignac number, because 99921305 - 2¹⁰ = 99920281 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164312 + ... + 164918.

It is an arithmetic number, because the mean of its divisors is an integer number (4251744).

Almost surely, 2^99921305 is an apocalyptic number.

It is an amenable number.

99921305 is a deficient number, since it is larger than the sum of its proper divisors (36134503).

99921305 is a wasteful number, since it uses less digits than its factorization.

99921305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 99921305 is about 9996.0644755824. The cubic root of 99921305 is about 464.0370947974.

The spelling of 99921305 in words is "ninety-nine million, nine hundred twenty-one thousand, three hundred five".