13231220331 has 16 divisors (see below), whose sum is σ = 20653613568. Its totient is φ = 7376289600.

The previous prime is 13231220287. The next prime is 13231220341. The reversal of 13231220331 is 13302213231.

It is not a de Polignac number, because 13231220331 - 2¹⁰ = 13231219307 is a prime.

It is a super-2 number, since 2×13231220331² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 13231220298 and 13231220307.

It is not an unprimeable number, because it can be changed into a prime (13231220341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7682775 + ... + 7684496.

It is an arithmetic number, because the mean of its divisors is an integer number (1290850848).

Almost surely, 2^13231220331 is an apocalyptic number.

13231220331 is a deficient number, since it is larger than the sum of its proper divisors (7422393237).

13231220331 is a wasteful number, since it uses less digits than its factorization.

13231220331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15367322.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 13231220331 its reverse (13302213231), we get a palindrome (26533433562).

The spelling of 13231220331 in words is "thirteen billion, two hundred thirty-one million, two hundred twenty thousand, three hundred thirty-one".