99921910 has 16 divisors (see below), whose sum is σ = 196210512. Its totient is φ = 36335200.

The previous prime is 99921883. The next prime is 99921911. The reversal of 99921910 is 1912999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99921911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454081 + ... + 454300.

It is an arithmetic number, because the mean of its divisors is an integer number (12263157).

Almost surely, 2^99921910 is an apocalyptic number.

99921910 is a deficient number, since it is larger than the sum of its proper divisors (96288602).

99921910 is a wasteful number, since it uses less digits than its factorization.

99921910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908399.

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 99921910 is about 9996.0947374462. The cubic root of 99921910 is about 464.0380313407.

The spelling of 99921910 in words is "ninety-nine million, nine hundred twenty-one thousand, nine hundred ten".