12668021 has 2 divisors, whose sum is σ = 12668022. Its totient is φ = 12668020.

The previous prime is 12667999. The next prime is 12668039. The reversal of 12668021 is 12086621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7761796 + 4906225 = 2786^2 + 2215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12668021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12668081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6334010 + 6334011.

It is an arithmetic number, because the mean of its divisors is an integer number (6334011).

Almost surely, 2^12668021 is an apocalyptic number.

It is an amenable number.

12668021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12668021 is an equidigital number, since it uses as much as digits as its factorization.

12668021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 12668021 is about 3559.2163463324. The cubic root of 12668021 is about 233.1146629356.

The spelling of 12668021 in words is "twelve million, six hundred sixty-eight thousand, twenty-one".