224222221 has 2 divisors, whose sum is σ = 224222222. Its totient is φ = 224222220.

The previous prime is 224222179. The next prime is 224222237. The reversal of 224222221 is 122222422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123520996 + 100701225 = 11114^2 + 10035^2 .

It is a cyclic number.

It is not a de Polignac number, because 224222221 - 2¹⁹ = 223697933 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 (224222261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112111110 + 112111111.

It is an arithmetic number, because the mean of its divisors is an integer number (112111111).

Almost surely, 2^224222221 is an apocalyptic number.

It is an amenable number.

224222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

224222221 is an equidigital number, since it uses as much as digits as its factorization.

224222221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 512, while the sum is 19.

The square root of 224222221 is about 14974.0515893328. The cubic root of 224222221 is about 607.5185594989.

Adding to 224222221 its reverse (122222422), we get a palindrome (346444643).

The spelling of 224222221 in words is "two hundred twenty-four million, two hundred twenty-two thousand, two hundred twenty-one".