12123121823 has 2 divisors, whose sum is σ = 12123121824. Its totient is φ = 12123121822.

The previous prime is 12123121811. The next prime is 12123121831. The reversal of 12123121823 is 32812132121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12123121823 - 2⁸ = 12123121567 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12123121792 and 12123121801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12123123823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061560911 + 6061560912.

It is an arithmetic number, because the mean of its divisors is an integer number (6061560912).

Almost surely, 2^12123121823 is an apocalyptic number.

12123121823 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123121823 is an equidigital number, since it uses as much as digits as its factorization.

12123121823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

Adding to 12123121823 its reverse (32812132121), we get a palindrome (44935253944).

The spelling of 12123121823 in words is "twelve billion, one hundred twenty-three million, one hundred twenty-one thousand, eight hundred twenty-three".