231212322031 has 4 divisors (see below), whose sum is σ = 238670784064. Its totient is φ = 223753860000.

The previous prime is 231212322023. The next prime is 231212322043. The reversal of 231212322031 is 130223212132.

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 231212322031 - 2³ = 231212322023 is a prime.

It is a super-2 number, since 2×231212322031² (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 = 231212321993 and 231212322011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231212325031) 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, 3729230970 + ... + 3729231031.

It is an arithmetic number, because the mean of its divisors is an integer number (59667696016).

Almost surely, 2^231212322031 is an apocalyptic number.

231212322031 is a deficient number, since it is larger than the sum of its proper divisors (7458462033).

231212322031 is an equidigital number, since it uses as much as digits as its factorization.

231212322031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7458462032.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 231212322031 its reverse (130223212132), we get a palindrome (361435534163).

The spelling of 231212322031 in words is "two hundred thirty-one billion, two hundred twelve million, three hundred twenty-two thousand, thirty-one".