12123821393 has 2 divisors, whose sum is σ = 12123821394. Its totient is φ = 12123821392.

The previous prime is 12123821389. The next prime is 12123821407. The reversal of 12123821393 is 39312832121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12123771664 + 49729 = 110108^2 + 223^2 .

It is a cyclic number.

It is not a de Polignac number, because 12123821393 - 2² = 12123821389 is a prime.

It is not a weakly prime, because it can be changed into another prime (12123821363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061910696 + 6061910697.

It is an arithmetic number, because the mean of its divisors is an integer number (6061910697).

Almost surely, 2^12123821393 is an apocalyptic number.

It is an amenable number.

12123821393 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123821393 is an equidigital number, since it uses as much as digits as its factorization.

12123821393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The spelling of 12123821393 in words is "twelve billion, one hundred twenty-three million, eight hundred twenty-one thousand, three hundred ninety-three".