231211122231 has 16 divisors (see below), whose sum is σ = 315538585856. Its totient is φ = 150553204416.

The previous prime is 231211122223. The next prime is 231211122343. The reversal of 231211122231 is 132221112132.

It is not a de Polignac number, because 231211122231 - 2³ = 231211122223 is a prime.

It is a super-2 number, since 2×231211122231² (a number of 24 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 = 231211122198 and 231211122207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231211122031) 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, 5102485 + ... + 5147598.

It is an arithmetic number, because the mean of its divisors is an integer number (19721161616).

Almost surely, 2^231211122231 is an apocalyptic number.

231211122231 is a deficient number, since it is larger than the sum of its proper divisors (84327463625).

231211122231 is a wasteful number, since it uses less digits than its factorization.

231211122231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10250262.

The product of its digits is 288, while the sum is 21.

Adding to 231211122231 its reverse (132221112132), we get a palindrome (363432234363).

The spelling of 231211122231 in words is "two hundred thirty-one billion, two hundred eleven million, one hundred twenty-two thousand, two hundred thirty-one".