21110099 has 2 divisors, whose sum is σ = 21110100. Its totient is φ = 21110098.

The previous prime is 21110093. The next prime is 21110123. The reversal of 21110099 is 99001112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21110099 - 2²⁰ = 20061523 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21110093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555049 + 10555050.

It is an arithmetic number, because the mean of its divisors is an integer number (10555050).

Almost surely, 2^21110099 is an apocalyptic number.

21110099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110099 is an equidigital number, since it uses as much as digits as its factorization.

21110099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 21110099 is about 4594.5727766573. The cubic root of 21110099 is about 276.3737279410.

The spelling of 21110099 in words is "twenty-one million, one hundred ten thousand, ninety-nine".