12320321021 has 2 divisors, whose sum is σ = 12320321022. Its totient is φ = 12320321020.

The previous prime is 12320321003. The next prime is 12320321023. The reversal of 12320321021 is 12012302321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12190588921 + 129732100 = 110411^2 + 11390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12320321021 is a prime.

Together with 12320321023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12320321023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6160160510 + 6160160511.

It is an arithmetic number, because the mean of its divisors is an integer number (6160160511).

Almost surely, 2^12320321021 is an apocalyptic number.

It is an amenable number.

12320321021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12320321021 is an equidigital number, since it uses as much as digits as its factorization.

12320321021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 12320321021 its reverse (12012302321), we get a palindrome (24332623342).

The spelling of 12320321021 in words is "twelve billion, three hundred twenty million, three hundred twenty-one thousand, twenty-one".