224330021 has 2 divisors, whose sum is σ = 224330022. Its totient is φ = 224330020.

The previous prime is 224330009. The next prime is 224330023. The reversal of 224330021 is 120033422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113848900 + 110481121 = 10670^2 + 10511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-224330021 is a prime.

Together with 224330023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (224330023) 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, 112165010 + 112165011.

It is an arithmetic number, because the mean of its divisors is an integer number (112165011).

Almost surely, 2^224330021 is an apocalyptic number.

It is an amenable number.

224330021 is a deficient number, since it is larger than the sum of its proper divisors (1).

224330021 is an equidigital number, since it uses as much as digits as its factorization.

224330021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 224330021 is about 14977.6507169850. The cubic root of 224330021 is about 607.6159034164.

Adding to 224330021 its reverse (120033422), we get a palindrome (344363443).

The spelling of 224330021 in words is "two hundred twenty-four million, three hundred thirty thousand, twenty-one".