12227221 has 2 divisors, whose sum is σ = 12227222. Its totient is φ = 12227220.

The previous prime is 12227213. The next prime is 12227227. The reversal of 12227221 is 12272221.

12227221 is digitally balanced in base 2, because in such base 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., 8346321 + 3880900 = 2889^2 + 1970^2 .

It is a cyclic number.

It is not a de Polignac number, because 12227221 - 2³ = 12227213 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 (12227227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6113610 + 6113611.

It is an arithmetic number, because the mean of its divisors is an integer number (6113611).

Almost surely, 2^12227221 is an apocalyptic number.

It is an amenable number.

12227221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12227221 is an equidigital number, since it uses as much as digits as its factorization.

12227221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224, while the sum is 19.

The square root of 12227221 is about 3496.7443429567. The cubic root of 12227221 is about 230.3788400566.

Adding to 12227221 its reverse (12272221), we get a palindrome (24499442).

It can be divided in two parts, 1 and 2227221, that added together give a palindrome (2227222).

The spelling of 12227221 in words is "twelve million, two hundred twenty-seven thousand, two hundred twenty-one".