21163199 has 2 divisors, whose sum is σ = 21163200. Its totient is φ = 21163198.

The previous prime is 21163189. The next prime is 21163201. The reversal of 21163199 is 99136112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21163199 is a prime.

Together with 21163201, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21163139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581599 + 10581600.

It is an arithmetic number, because the mean of its divisors is an integer number (10581600).

Almost surely, 2^21163199 is an apocalyptic number.

21163199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21163199 is an equidigital number, since it uses as much as digits as its factorization.

21163199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 32.

The square root of 21163199 is about 4600.3477042502. The cubic root of 21163199 is about 276.6052625781.

The spelling of 21163199 in words is "twenty-one million, one hundred sixty-three thousand, one hundred ninety-nine".