224421221 has 2 divisors, whose sum is σ = 224421222. Its totient is φ = 224421220.

The previous prime is 224421203. The next prime is 224421247. The reversal of 224421221 is 122124422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199120321 + 25300900 = 14111^2 + 5030^2 .

It is a cyclic number.

It is not a de Polignac number, because 224421221 - 2⁶ = 224421157 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 224421193 and 224421202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (224421721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112210610 + 112210611.

It is an arithmetic number, because the mean of its divisors is an integer number (112210611).

Almost surely, 2^224421221 is an apocalyptic number.

It is an amenable number.

224421221 is a deficient number, since it is larger than the sum of its proper divisors (1).

224421221 is an equidigital number, since it uses as much as digits as its factorization.

224421221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 512, while the sum is 20.

The square root of 224421221 is about 14980.6949438269. The cubic root of 224421221 is about 607.6982331055.

Adding to 224421221 its reverse (122124422), we get a palindrome (346545643).

The spelling of 224421221 in words is "two hundred twenty-four million, four hundred twenty-one thousand, two hundred twenty-one".