231222221031 has 4 divisors (see below), whose sum is σ = 308296294712. Its totient is φ = 154148147352.

The previous prime is 231222221017. The next prime is 231222221033. The reversal of 231222221031 is 130122222132.

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

It is not a de Polignac number, because 231222221031 - 2⁶ = 231222220967 is a prime.

It is a super-2 number, since 2×231222221031² (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 = 231222220989 and 231222221007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231222221033) 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, 38537036836 + ... + 38537036841.

It is an arithmetic number, because the mean of its divisors is an integer number (77074073678).

Almost surely, 2^231222221031 is an apocalyptic number.

231222221031 is a deficient number, since it is larger than the sum of its proper divisors (77074073681).

231222221031 is an equidigital number, since it uses as much as digits as its factorization.

231222221031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77074073680.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 231222221031 its reverse (130122222132), we get a palindrome (361344443163).

The spelling of 231222221031 in words is "two hundred thirty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, thirty-one".