123113231121 has 4 divisors (see below), whose sum is σ = 164150974832. Its totient is φ = 82075487412.

The previous prime is 123113231089. The next prime is 123113231233. The reversal of 123113231121 is 121132311321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 123113231121 - 2⁵ = 123113231089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123113231921) 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, 20518871851 + ... + 20518871856.

It is an arithmetic number, because the mean of its divisors is an integer number (41037743708).

Almost surely, 2^123113231121 is an apocalyptic number.

It is an amenable number.

123113231121 is a deficient number, since it is larger than the sum of its proper divisors (41037743711).

123113231121 is an equidigital number, since it uses as much as digits as its factorization.

123113231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41037743710.

The product of its digits is 216, while the sum is 21.

Adding to 123113231121 its reverse (121132311321), we get a palindrome (244245542442).

The spelling of 123113231121 in words is "one hundred twenty-three billion, one hundred thirteen million, two hundred thirty-one thousand, one hundred twenty-one".