12324821 has 2 divisors, whose sum is σ = 12324822. Its totient is φ = 12324820.

The previous prime is 12324799. The next prime is 12324827. The reversal of 12324821 is 12842321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11662225 + 662596 = 3415^2 + 814^2 .

It is an emirp because it is prime and its reverse (12842321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12324821 - 2¹⁰ = 12323797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12324827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6162410 + 6162411.

It is an arithmetic number, because the mean of its divisors is an integer number (6162411).

Almost surely, 2^12324821 is an apocalyptic number.

It is an amenable number.

12324821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12324821 is an equidigital number, since it uses as much as digits as its factorization.

12324821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 23.

The square root of 12324821 is about 3510.6724427095. The cubic root of 12324821 is about 230.9901921712.

The spelling of 12324821 in words is "twelve million, three hundred twenty-four thousand, eight hundred twenty-one".