13221612231 has 4 divisors (see below), whose sum is σ = 17628816312. Its totient is φ = 8814408152.

The previous prime is 13221612221. The next prime is 13221612233.

13221612231 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 13221612231 - 2⁵ = 13221612199 is a prime.

It is a super-2 number, since 2×13221612231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221612233) 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, 2203602036 + ... + 2203602041.

It is an arithmetic number, because the mean of its divisors is an integer number (4407204078).

Almost surely, 2^13221612231 is an apocalyptic number.

13221612231 is a deficient number, since it is larger than the sum of its proper divisors (4407204081).

13221612231 is an equidigital number, since it uses as much as digits as its factorization.

13221612231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4407204080.

The product of its digits is 864, while the sum is 24.

The spelling of 13221612231 in words is "thirteen billion, two hundred twenty-one million, six hundred twelve thousand, two hundred thirty-one".