21107199 has 4 divisors (see below), whose sum is σ = 28142936. Its totient is φ = 14071464.

The previous prime is 21107189. The next prime is 21107209. The reversal of 21107199 is 99170112.

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

It is an interprime number because it is at equal distance from previous prime (21107189) and next prime (21107209).

It is not a de Polignac number, because 21107199 - 2⁵ = 21107167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21107189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3517864 + ... + 3517869.

It is an arithmetic number, because the mean of its divisors is an integer number (7035734).

Almost surely, 2^21107199 is an apocalyptic number.

21107199 is a deficient number, since it is larger than the sum of its proper divisors (7035737).

21107199 is an equidigital number, since it uses as much as digits as its factorization.

21107199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7035736.

The product of its (nonzero) digits is 1134, while the sum is 30.

The square root of 21107199 is about 4594.2571760841. The cubic root of 21107199 is about 276.3610717472.

The spelling of 21107199 in words is "twenty-one million, one hundred seven thousand, one hundred ninety-nine".