31213233110231 has 4 divisors (see below), whose sum is σ = 31214048690352. Its totient is φ = 31212417530112.

The previous prime is 31213233110221. The next prime is 31213233110281. The reversal of 31213233110231 is 13201133231213.

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 31213233110231 - 2⁶ = 31213233110167 is a prime.

It is a super-2 number, since 2×31213233110231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31213233110231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213233110221) 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, 407732651 + ... + 407809196.

It is an arithmetic number, because the mean of its divisors is an integer number (7803512172588).

Almost surely, 2^{31213233110231} is an apocalyptic number.

31213233110231 is a deficient number, since it is larger than the sum of its proper divisors (815580121).

31213233110231 is an equidigital number, since it uses as much as digits as its factorization.

31213233110231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815580120.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 31213233110231 its reverse (13201133231213), we get a palindrome (44414366341444).

The spelling of 31213233110231 in words is "thirty-one trillion, two hundred thirteen billion, two hundred thirty-three million, one hundred ten thousand, two hundred thirty-one".