231212113123 has 16 divisors (see below), whose sum is σ = 241918380000. Its totient is φ = 220697229312.

The previous prime is 231212113103. The next prime is 231212113127. The reversal of 231212113123 is 321311212132.

It is a cyclic number.

It is not a de Polignac number, because 231212113123 - 2¹⁷ = 231211982051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231212113094 and 231212113103.

It is not an unprimeable number, because it can be changed into a prime (231212113127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1337836 + ... + 1500742.

It is an arithmetic number, because the mean of its divisors is an integer number (15119898750).

Almost surely, 2^231212113123 is an apocalyptic number.

231212113123 is a deficient number, since it is larger than the sum of its proper divisors (10706266877).

231212113123 is a wasteful number, since it uses less digits than its factorization.

231212113123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163494.

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

Adding to 231212113123 its reverse (321311212132), we get a palindrome (552523325255).

Subtracting 231212113123 from its reverse (321311212132), we obtain a palindrome (90099099009).

The spelling of 231212113123 in words is "two hundred thirty-one billion, two hundred twelve million, one hundred thirteen thousand, one hundred twenty-three".