12123400123 has 8 divisors (see below), whose sum is σ = 12181055040. Its totient is φ = 12065782920.

The previous prime is 12123400099. The next prime is 12123400153. The reversal of 12123400123 is 32100432121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12123400123 - 2⁹ = 12123399611 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 12123400123.

It is not an unprimeable number, because it can be changed into a prime (12123400153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 795808 + ... + 810898.

It is an arithmetic number, because the mean of its divisors is an integer number (1522631880).

Almost surely, 2^12123400123 is an apocalyptic number.

12123400123 is a deficient number, since it is larger than the sum of its proper divisors (57654917).

12123400123 is a wasteful number, since it uses less digits than its factorization.

12123400123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18857.

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

Adding to 12123400123 its reverse (32100432121), we get a palindrome (44223832244).

The spelling of 12123400123 in words is "twelve billion, one hundred twenty-three million, four hundred thousand, one hundred twenty-three".