13220720131 has 4 divisors (see below), whose sum is σ = 13225070664. Its totient is φ = 13216369600.

The previous prime is 13220720111. The next prime is 13220720147. The reversal of 13220720131 is 13102702231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13102702231 = 18353 ⋅713927.

It is a cyclic number.

It is not a de Polignac number, because 13220720131 - 2⁹ = 13220719619 is a prime.

It is a super-2 number, since 2×13220720131² (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 (13220720111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2170705 + ... + 2176786.

It is an arithmetic number, because the mean of its divisors is an integer number (3306267666).

Almost surely, 2^13220720131 is an apocalyptic number.

13220720131 is a deficient number, since it is larger than the sum of its proper divisors (4350533).

13220720131 is an equidigital number, since it uses as much as digits as its factorization.

13220720131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4350532.

The product of its (nonzero) digits is 504, while the sum is 22.

The spelling of 13220720131 in words is "thirteen billion, two hundred twenty million, seven hundred twenty thousand, one hundred thirty-one".