99902921 has 4 divisors (see below), whose sum is σ = 99976644. Its totient is φ = 99829200.

The previous prime is 99902911. The next prime is 99902939. The reversal of 99902921 is 12920999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69222400 + 30680521 = 8320^2 + 5539^2 .

It is a cyclic number.

It is not a de Polignac number, because 99902921 - 2⁶ = 99902857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99902911) 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, 34790 + ... + 37551.

It is an arithmetic number, because the mean of its divisors is an integer number (24994161).

Almost surely, 2^99902921 is an apocalyptic number.

It is an amenable number.

99902921 is a deficient number, since it is larger than the sum of its proper divisors (73723).

99902921 is a wasteful number, since it uses less digits than its factorization.

99902921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73722.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 99902921 is about 9995.1448713863. The cubic root of 99902921 is about 464.0086344633.

The spelling of 99902921 in words is "ninety-nine million, nine hundred two thousand, nine hundred twenty-one".