231222222131 has 4 divisors (see below), whose sum is σ = 231228374832. Its totient is φ = 231216069432.

The previous prime is 231222222107. The next prime is 231222222137. The reversal of 231222222131 is 131222222132.

It is a happy number.

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 231222222131 - 2¹⁰ = 231222221107 is a prime.

It is a super-2 number, since 2×231222222131² (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 = 231222222097 and 231222222106.

It is not an unprimeable number, because it can be changed into a prime (231222222137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3019631 + ... + 3095256.

It is an arithmetic number, because the mean of its divisors is an integer number (57807093708).

Almost surely, 2^231222222131 is an apocalyptic number.

231222222131 is a deficient number, since it is larger than the sum of its proper divisors (6152701).

231222222131 is an equidigital number, since it uses as much as digits as its factorization.

231222222131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6152700.

The product of its digits is 1152, while the sum is 23.

Adding to 231222222131 its reverse (131222222132), we get a palindrome (362444444263).

Subtracting from 231222222131 its reverse (131222222132), we obtain a palindrome (99999999999).

The spelling of 231222222131 in words is "two hundred thirty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred thirty-one".