13221002131 has 4 divisors (see below), whose sum is σ = 13223688264. Its totient is φ = 13218316000.

The previous prime is 13221002083. The next prime is 13221002167. The reversal of 13221002131 is 13120012231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13120012231 = 31 ⋅423226201.

It is a cyclic number.

It is not a de Polignac number, because 13221002131 - 2²³ = 13212613523 is a prime.

It is a super-2 number, since 2×13221002131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13221002831) 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, 1335670 + ... + 1345531.

It is an arithmetic number, because the mean of its divisors is an integer number (3305922066).

Almost surely, 2^13221002131 is an apocalyptic number.

13221002131 is a deficient number, since it is larger than the sum of its proper divisors (2686133).

13221002131 is an equidigital number, since it uses as much as digits as its factorization.

13221002131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2686132.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 13221002131 its reverse (13120012231), we get a palindrome (26341014362).

It can be divided in two parts, 1322100 and 2131, that added together give a palindrome (1324231).

The spelling of 13221002131 in words is "thirteen billion, two hundred twenty-one million, two thousand, one hundred thirty-one".