13220312131 has 6 divisors (see below), whose sum is σ = 14315486100. Its totient is φ = 12203364888.

The previous prime is 13220312129. The next prime is 13220312159. The reversal of 13220312131 is 13121302231.

It is not a de Polignac number, because 13220312131 - 2¹ = 13220312129 is a prime.

It is a super-2 number, since 2×13220312131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13220312099 and 13220312108.

It is not an unprimeable number, because it can be changed into a prime (13220319131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39113181 + ... + 39113518.

It is an arithmetic number, because the mean of its divisors is an integer number (2385914350).

Almost surely, 2^13220312131 is an apocalyptic number.

13220312131 is a deficient number, since it is larger than the sum of its proper divisors (1095173969).

13220312131 is an equidigital number, since it uses as much as digits as its factorization.

13220312131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78226725 (or 78226712 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 13220312131 its reverse (13121302231), we get a palindrome (26341614362).

The spelling of 13220312131 in words is "thirteen billion, two hundred twenty million, three hundred twelve thousand, one hundred thirty-one".