123403121021023 has 4 divisors (see below), whose sum is σ = 123565280182128. Its totient is φ = 123240961859920.

The previous prime is 123403121020969. The next prime is 123403121021051. The reversal of 123403121021023 is 320120121304321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123403121021023 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 (123403121021093) 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, 81079579411 + ... + 81079580932.

It is an arithmetic number, because the mean of its divisors is an integer number (30891320045532).

Almost surely, 2^{123403121021023} is an apocalyptic number.

123403121021023 is a deficient number, since it is larger than the sum of its proper divisors (162159161105).

123403121021023 is an equidigital number, since it uses as much as digits as its factorization.

123403121021023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162159161104.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 123403121021023 its reverse (320120121304321), we get a palindrome (443523242325344).

The spelling of 123403121021023 in words is "one hundred twenty-three trillion, four hundred three billion, one hundred twenty-one million, twenty-one thousand, twenty-three".