123123121101223 has 4 divisors (see below), whose sum is σ = 123139915968888. Its totient is φ = 123106326233560.

The previous prime is 123123121101157. The next prime is 123123121101247. The reversal of 123123121101223 is 322101121321321.

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 123123121101223 - 2¹³ = 123123121093031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123123121101623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8397422836 + ... + 8397437497.

It is an arithmetic number, because the mean of its divisors is an integer number (30784978992222).

Almost surely, 2^{123123121101223} is an apocalyptic number.

123123121101223 is a deficient number, since it is larger than the sum of its proper divisors (16794867665).

123123121101223 is an equidigital number, since it uses as much as digits as its factorization.

123123121101223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16794867664.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 123123121101223 its reverse (322101121321321), we get a palindrome (445224242422544).

The spelling of 123123121101223 in words is "one hundred twenty-three trillion, one hundred twenty-three billion, one hundred twenty-one million, one hundred one thousand, two hundred twenty-three".