231211312123 has 8 divisors (see below), whose sum is σ = 267067612080. Its totient is φ = 197827860480.

The previous prime is 231211312109. The next prime is 231211312147. The reversal of 231211312123 is 321213112132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231211312123 - 2⁵ = 231211312091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231211312094 and 231211312103.

It is not an unprimeable number, because it can be changed into a prime (231211312183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618211878 + ... + 618212251.

It is an arithmetic number, because the mean of its divisors is an integer number (33383451510).

Almost surely, 2^231211312123 is an apocalyptic number.

231211312123 is a deficient number, since it is larger than the sum of its proper divisors (35856299957).

231211312123 is a wasteful number, since it uses less digits than its factorization.

231211312123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236424157.

The product of its digits is 432, while the sum is 22.

Adding to 231211312123 its reverse (321213112132), we get a palindrome (552424424255).

Subtracting 231211312123 from its reverse (321213112132), we obtain a square (90001800009 = 300003²).

The spelling of 231211312123 in words is "two hundred thirty-one billion, two hundred eleven million, three hundred twelve thousand, one hundred twenty-three".