13221006663 has 4 divisors (see below), whose sum is σ = 17628008888. Its totient is φ = 8814004440.

The previous prime is 13221006637. The next prime is 13221006691. The reversal of 13221006663 is 36660012231.

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

It is not a de Polignac number, because 13221006663 - 2²⁵ = 13187452231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13221006663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221006613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2203501108 + ... + 2203501113.

It is an arithmetic number, because the mean of its divisors is an integer number (4407002222).

Almost surely, 2^13221006663 is an apocalyptic number.

13221006663 is a deficient number, since it is larger than the sum of its proper divisors (4407002225).

13221006663 is an equidigital number, since it uses as much as digits as its factorization.

13221006663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4407002224.

The product of its (nonzero) digits is 7776, while the sum is 30.

Adding to 13221006663 its reverse (36660012231), we get a palindrome (49881018894).

The spelling of 13221006663 in words is "thirteen billion, two hundred twenty-one million, six thousand, six hundred sixty-three".