13231220231 has 4 divisors (see below), whose sum is σ = 13232056200. Its totient is φ = 13230384264.

The previous prime is 13231220201. The next prime is 13231220237. The reversal of 13231220231 is 13202213231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13202213231 = 1013 ⋅13032787.

It is a cyclic number.

It is not a de Polignac number, because 13231220231 - 2¹⁰ = 13231219207 is a prime.

It is a super-2 number, since 2×13231220231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231220237) 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, 393776 + ... + 426053.

It is an arithmetic number, because the mean of its divisors is an integer number (3308014050).

Almost surely, 2^13231220231 is an apocalyptic number.

13231220231 is a deficient number, since it is larger than the sum of its proper divisors (835969).

13231220231 is an equidigital number, since it uses as much as digits as its factorization.

13231220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835968.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 13231220231 its reverse (13202213231), we get a palindrome (26433433462).

The spelling of 13231220231 in words is "thirteen billion, two hundred thirty-one million, two hundred twenty thousand, two hundred thirty-one".