21199014959 has 2 divisors, whose sum is σ = 21199014960. Its totient is φ = 21199014958.

The previous prime is 21199014899. The next prime is 21199014997. The reversal of 21199014959 is 95941099112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21199014959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21199014559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10599507479 + 10599507480.

It is an arithmetic number, because the mean of its divisors is an integer number (10599507480).

Almost surely, 2^21199014959 is an apocalyptic number.

21199014959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21199014959 is an equidigital number, since it uses as much as digits as its factorization.

21199014959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 262440, while the sum is 50.

The spelling of 21199014959 in words is "twenty-one billion, one hundred ninety-nine million, fourteen thousand, nine hundred fifty-nine".