99099100021 has 2 divisors, whose sum is σ = 99099100022. Its totient is φ = 99099100020.

The previous prime is 99099100013. The next prime is 99099100097. The reversal of 99099100021 is 12000199099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93727822500 + 5371277521 = 306150^2 + 73289^2 .

It is a cyclic number.

It is not a de Polignac number, because 99099100021 - 2³ = 99099100013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99099200021) 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 as a sum of consecutive naturals, namely, 49549550010 + 49549550011.

It is an arithmetic number, because the mean of its divisors is an integer number (49549550011).

Almost surely, 2^99099100021 is an apocalyptic number.

It is an amenable number.

99099100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

99099100021 is an equidigital number, since it uses as much as digits as its factorization.

99099100021 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 99099100021 in words is "ninety-nine billion, ninety-nine million, one hundred thousand, twenty-one".