231332221231 has 4 divisors (see below), whose sum is σ = 233153734912. Its totient is φ = 229510707552.

The previous prime is 231332221213. The next prime is 231332221243. The reversal of 231332221231 is 132122233132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231332221231 - 2⁹ = 231332220719 is a prime.

It is a super-2 number, since 2×231332221231² (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 = 231332221196 and 231332221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231332221261) 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, 910756650 + ... + 910756903.

It is an arithmetic number, because the mean of its divisors is an integer number (58288433728).

Almost surely, 2^231332221231 is an apocalyptic number.

231332221231 is a deficient number, since it is larger than the sum of its proper divisors (1821513681).

231332221231 is a wasteful number, since it uses less digits than its factorization.

231332221231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821513680.

The product of its digits is 2592, while the sum is 25.

Adding to 231332221231 its reverse (132122233132), we get a palindrome (363454454363).

The spelling of 231332221231 in words is "two hundred thirty-one billion, three hundred thirty-two million, two hundred twenty-one thousand, two hundred thirty-one".