12403120123 has 4 divisors (see below), whose sum is σ = 12403400688. Its totient is φ = 12402839560.

The previous prime is 12403120111. The next prime is 12403120129. The reversal of 12403120123 is 32102130421.

It is a happy number.

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 12403120123 - 2⁵ = 12403120091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12403120123.

It is not an unprimeable number, because it can be changed into a prime (12403120129) 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, 57808 + ... + 167773.

It is an arithmetic number, because the mean of its divisors is an integer number (3100850172).

Almost surely, 2^12403120123 is an apocalyptic number.

12403120123 is a deficient number, since it is larger than the sum of its proper divisors (280565).

12403120123 is an equidigital number, since it uses as much as digits as its factorization.

12403120123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280564.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 12403120123 its reverse (32102130421), we get a palindrome (44505250544).

The spelling of 12403120123 in words is "twelve billion, four hundred three million, one hundred twenty thousand, one hundred twenty-three".