12123121223 has 4 divisors (see below), whose sum is σ = 12149419128. Its totient is φ = 12096823320.

The previous prime is 12123121201. The next prime is 12123121289. The reversal of 12123121223 is 32212132121.

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 12123121223 - 2⁶ = 12123121159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12123121195 and 12123121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123121823) 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, 13148261 + ... + 13149182.

It is an arithmetic number, because the mean of its divisors is an integer number (3037354782).

Almost surely, 2^12123121223 is an apocalyptic number.

12123121223 is a deficient number, since it is larger than the sum of its proper divisors (26297905).

12123121223 is an equidigital number, since it uses as much as digits as its factorization.

12123121223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26297904.

The product of its digits is 288, while the sum is 20.

Adding to 12123121223 its reverse (32212132121), we get a palindrome (44335253344).

The spelling of 12123121223 in words is "twelve billion, one hundred twenty-three million, one hundred twenty-one thousand, two hundred twenty-three".