231321223100031 has 4 divisors (see below), whose sum is σ = 308428297466712. Its totient is φ = 154214148733352.

The previous prime is 231321223099937. The next prime is 231321223100057. The reversal of 231321223100031 is 130001322123132.

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 231321223100031 - 2³⁵ = 231286863361663 is a prime.

It is a super-2 number, since 2×231321223100031² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231321223099974 and 231321223100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231321123100031) 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, 38553537183336 + ... + 38553537183341.

It is an arithmetic number, because the mean of its divisors is an integer number (77107074366678).

Almost surely, 2^{231321223100031} is an apocalyptic number.

231321223100031 is a deficient number, since it is larger than the sum of its proper divisors (77107074366681).

231321223100031 is an equidigital number, since it uses as much as digits as its factorization.

231321223100031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77107074366680.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 231321223100031 its reverse (130001322123132), we get a palindrome (361322545223163).

The spelling of 231321223100031 in words is "two hundred thirty-one trillion, three hundred twenty-one billion, two hundred twenty-three million, one hundred thousand, thirty-one".