231221133123 has 4 divisors (see below), whose sum is σ = 308294844168. Its totient is φ = 154147422080.

The previous prime is 231221133113. The next prime is 231221133131. The reversal of 231221133123 is 321331122132.

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 231221133123 - 2²⁰ = 231220084547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231221133093 and 231221133102.

It is not an unprimeable number, because it can be changed into a prime (231221133103) 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, 38536855518 + ... + 38536855523.

It is an arithmetic number, because the mean of its divisors is an integer number (77073711042).

Almost surely, 2^231221133123 is an apocalyptic number.

231221133123 is a deficient number, since it is larger than the sum of its proper divisors (77073711045).

231221133123 is an equidigital number, since it uses as much as digits as its factorization.

231221133123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77073711044.

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

Adding to 231221133123 its reverse (321331122132), we get a palindrome (552552255255).

The spelling of 231221133123 in words is "two hundred thirty-one billion, two hundred twenty-one million, one hundred thirty-three thousand, one hundred twenty-three".