12243221 has 2 divisors, whose sum is σ = 12243222. Its totient is φ = 12243220.

The previous prime is 12243197. The next prime is 12243227. The reversal of 12243221 is 12234221.

12243221 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11458225 + 784996 = 3385^2 + 886^2 .

It is a cyclic number.

It is not a de Polignac number, because 12243221 - 2⁶ = 12243157 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12243221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12243227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6121610 + 6121611.

It is an arithmetic number, because the mean of its divisors is an integer number (6121611).

Almost surely, 2^12243221 is an apocalyptic number.

It is an amenable number.

12243221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12243221 is an equidigital number, since it uses as much as digits as its factorization.

12243221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 17.

The square root of 12243221 is about 3499.0314374124. The cubic root of 12243221 is about 230.4792841068.

Adding to 12243221 its reverse (12234221), we get a palindrome (24477442).

The spelling of 12243221 in words is "twelve million, two hundred forty-three thousand, two hundred twenty-one".