12312230621 has 2 divisors, whose sum is σ = 12312230622. Its totient is φ = 12312230620.

The previous prime is 12312230611. The next prime is 12312230663. The reversal of 12312230621 is 12603221321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9665642596 + 2646588025 = 98314^2 + 51445^2 .

It is an emirp because it is prime and its reverse (12603221321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12312230621 - 2²² = 12308036317 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12312230611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6156115310 + 6156115311.

It is an arithmetic number, because the mean of its divisors is an integer number (6156115311).

Almost surely, 2^12312230621 is an apocalyptic number.

It is an amenable number.

12312230621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12312230621 is an equidigital number, since it uses as much as digits as its factorization.

12312230621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 12312230621 its reverse (12603221321), we get a palindrome (24915451942).

The spelling of 12312230621 in words is "twelve billion, three hundred twelve million, two hundred thirty thousand, six hundred twenty-one".