224022221 has 2 divisors, whose sum is σ = 224022222. Its totient is φ = 224022220.

The previous prime is 224022203. The next prime is 224022223. The reversal of 224022221 is 122220422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129640996 + 94381225 = 11386^2 + 9715^2 .

It is a cyclic number.

It is not a de Polignac number, because 224022221 - 2⁶ = 224022157 is a prime.

Together with 224022223, it forms a pair of twin primes.

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 224022221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (224022223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112011110 + 112011111.

It is an arithmetic number, because the mean of its divisors is an integer number (112011111).

Almost surely, 2^224022221 is an apocalyptic number.

It is an amenable number.

224022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

224022221 is an equidigital number, since it uses as much as digits as its factorization.

224022221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 224022221 is about 14967.3718801933. The cubic root of 224022221 is about 607.3378758669.

Adding to 224022221 its reverse (122220422), we get a palindrome (346242643).

The spelling of 224022221 in words is "two hundred twenty-four million, twenty-two thousand, two hundred twenty-one".