13211999959 has 4 divisors (see below), whose sum is σ = 13519255816. Its totient is φ = 12904744104.

The previous prime is 13211999953. The next prime is 13211999971. The reversal of 13211999959 is 95999911231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13211999959 - 2⁷ = 13211999831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13211999953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153627864 + ... + 153627949.

It is an arithmetic number, because the mean of its divisors is an integer number (3379813954).

Almost surely, 2^13211999959 is an apocalyptic number.

13211999959 is a deficient number, since it is larger than the sum of its proper divisors (307255857).

13211999959 is an equidigital number, since it uses as much as digits as its factorization.

13211999959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307255856.

The product of its digits is 1771470, while the sum is 58.

The spelling of 13211999959 in words is "thirteen billion, two hundred eleven million, nine hundred ninety-nine thousand, nine hundred fifty-nine".