21030321199 has 2 divisors, whose sum is σ = 21030321200. Its totient is φ = 21030321198.

The previous prime is 21030321173. The next prime is 21030321227. The reversal of 21030321199 is 99112303012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21030321199 - 2⁷ = 21030321071 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21030321199.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030321799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515160599 + 10515160600.

It is an arithmetic number, because the mean of its divisors is an integer number (10515160600).

Almost surely, 2^21030321199 is an apocalyptic number.

21030321199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030321199 is an equidigital number, since it uses as much as digits as its factorization.

21030321199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The spelling of 21030321199 in words is "twenty-one billion, thirty million, three hundred twenty-one thousand, one hundred ninety-nine".