21115120199 has 2 divisors, whose sum is σ = 21115120200. Its totient is φ = 21115120198.

The previous prime is 21115120193. The next prime is 21115120207. The reversal of 21115120199 is 99102151112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21115120199 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21115120193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557560099 + 10557560100.

It is an arithmetic number, because the mean of its divisors is an integer number (10557560100).

Almost surely, 2^21115120199 is an apocalyptic number.

21115120199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21115120199 is an equidigital number, since it uses as much as digits as its factorization.

21115120199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 32.

The spelling of 21115120199 in words is "twenty-one billion, one hundred fifteen million, one hundred twenty thousand, one hundred ninety-nine".