12310021 has 2 divisors, whose sum is σ = 12310022. Its totient is φ = 12310020.

The previous prime is 12310019. The next prime is 12310027. The reversal of 12310021 is 12001321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12173121 + 136900 = 3489^2 + 370^2 .

It is a cyclic number.

It is not a de Polignac number, because 12310021 - 2¹ = 12310019 is a prime.

Together with 12310019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12310027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6155010 + 6155011.

It is an arithmetic number, because the mean of its divisors is an integer number (6155011).

Almost surely, 2^12310021 is an apocalyptic number.

It is an amenable number.

12310021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12310021 is an equidigital number, since it uses as much as digits as its factorization.

12310021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 12310021 is about 3508.5639512484. The cubic root of 12310021 is about 230.8976952453.

Adding to 12310021 its reverse (12001321), we get a palindrome (24311342).

The spelling of 12310021 in words is "twelve million, three hundred ten thousand, twenty-one".