12641021 has 2 divisors, whose sum is σ = 12641022. Its totient is φ = 12641020.

The previous prime is 12641017. The next prime is 12641051. The reversal of 12641021 is 12014621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9703225 + 2937796 = 3115^2 + 1714^2 .

It is a cyclic number.

It is not a de Polignac number, because 12641021 - 2² = 12641017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12641051) 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, 6320510 + 6320511.

It is an arithmetic number, because the mean of its divisors is an integer number (6320511).

Almost surely, 2^12641021 is an apocalyptic number.

It is an amenable number.

12641021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12641021 is an equidigital number, since it uses as much as digits as its factorization.

12641021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 12641021 is about 3555.4213533701. The cubic root of 12641021 is about 232.9489287391.

Adding to 12641021 its reverse (12014621), we get a palindrome (24655642).

The spelling of 12641021 in words is "twelve million, six hundred forty-one thousand, twenty-one".