12644213 has 2 divisors, whose sum is σ = 12644214. Its totient is φ = 12644212.

The previous prime is 12644207. The next prime is 12644237. The reversal of 12644213 is 31244621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9102289 + 3541924 = 3017^2 + 1882^2 .

It is a cyclic number.

It is not a de Polignac number, because 12644213 - 2⁴ = 12644197 is a prime.

It is a super-2 number, since 2×12644213² = 319752244778738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12644293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6322106 + 6322107.

It is an arithmetic number, because the mean of its divisors is an integer number (6322107).

Almost surely, 2^12644213 is an apocalyptic number.

It is an amenable number.

12644213 is a deficient number, since it is larger than the sum of its proper divisors (1).

12644213 is an equidigital number, since it uses as much as digits as its factorization.

12644213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 12644213 is about 3555.8702169792. The cubic root of 12644213 is about 232.9685344973.

Adding to 12644213 its reverse (31244621), we get a palindrome (43888834).

The spelling of 12644213 in words is "twelve million, six hundred forty-four thousand, two hundred thirteen".