224343221 has 2 divisors, whose sum is σ = 224343222. Its totient is φ = 224343220.

The previous prime is 224343199. The next prime is 224343233. The reversal of 224343221 is 122343422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166126321 + 58216900 = 12889^2 + 7630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-224343221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (224243221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112171610 + 112171611.

It is an arithmetic number, because the mean of its divisors is an integer number (112171611).

Almost surely, 2^224343221 is an apocalyptic number.

It is an amenable number.

224343221 is a deficient number, since it is larger than the sum of its proper divisors (1).

224343221 is an equidigital number, since it uses as much as digits as its factorization.

224343221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 23.

The square root of 224343221 is about 14978.0913670601. The cubic root of 224343221 is about 607.6278209366.

Adding to 224343221 its reverse (122343422), we get a palindrome (346686643).

The spelling of 224343221 in words is "two hundred twenty-four million, three hundred forty-three thousand, two hundred twenty-one".