13221811679 has 4 divisors (see below), whose sum is σ = 13338818976. Its totient is φ = 13104804384.

The previous prime is 13221811663. The next prime is 13221811697. The reversal of 13221811679 is 97611812231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97611812231 = 479 ⋅203782489.

It is a cyclic number.

It is not a de Polignac number, because 13221811679 - 2⁴ = 13221811663 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 (13221811619) 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, 58503479 + ... + 58503704.

It is an arithmetic number, because the mean of its divisors is an integer number (3334704744).

Almost surely, 2^13221811679 is an apocalyptic number.

13221811679 is a deficient number, since it is larger than the sum of its proper divisors (117007297).

13221811679 is a wasteful number, since it uses less digits than its factorization.

13221811679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117007296.

The product of its digits is 36288, while the sum is 41.

The spelling of 13221811679 in words is "thirteen billion, two hundred twenty-one million, eight hundred eleven thousand, six hundred seventy-nine".