21202311899 has 2 divisors, whose sum is σ = 21202311900. Its totient is φ = 21202311898.

The previous prime is 21202311857. The next prime is 21202311901. The reversal of 21202311899 is 99811320212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202311899 is a prime.

Together with 21202311901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21202314899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601155949 + 10601155950.

It is an arithmetic number, because the mean of its divisors is an integer number (10601155950).

Almost surely, 2^21202311899 is an apocalyptic number.

21202311899 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202311899 is an equidigital number, since it uses as much as digits as its factorization.

21202311899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The spelling of 21202311899 in words is "twenty-one billion, two hundred two million, three hundred eleven thousand, eight hundred ninety-nine".