223621217 has 2 divisors, whose sum is σ = 223621218. Its totient is φ = 223621216.

The previous prime is 223621193. The next prime is 223621261. The reversal of 223621217 is 712126322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179318881 + 44302336 = 13391^2 + 6656^2 .

It is a cyclic number.

It is not a de Polignac number, because 223621217 - 2²² = 219426913 is a prime.

It is a super-2 number, since 2×223621217² = 100012897385122178, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (223621267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111810608 + 111810609.

It is an arithmetic number, because the mean of its divisors is an integer number (111810609).

Almost surely, 2^223621217 is an apocalyptic number.

It is an amenable number.

223621217 is a deficient number, since it is larger than the sum of its proper divisors (1).

223621217 is an equidigital number, since it uses as much as digits as its factorization.

223621217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

The square root of 223621217 is about 14953.9699411227. The cubic root of 223621217 is about 606.9752773446.

Adding to 223621217 its reverse (712126322), we get a palindrome (935747539).

The spelling of 223621217 in words is "two hundred twenty-three million, six hundred twenty-one thousand, two hundred seventeen".