222240217 has 2 divisors, whose sum is σ = 222240218. Its totient is φ = 222240216.

The previous prime is 222240199. The next prime is 222240223. The reversal of 222240217 is 712042222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135582736 + 86657481 = 11644^2 + 9309^2 .

It is a cyclic number.

It is not a de Polignac number, because 222240217 - 2¹⁵ = 222207449 is a prime.

It is equal to p_12239203 and since 222240217 and 12239203 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (222240247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111120108 + 111120109.

It is an arithmetic number, because the mean of its divisors is an integer number (111120109).

Almost surely, 2^222240217 is an apocalyptic number.

It is an amenable number.

222240217 is a deficient number, since it is larger than the sum of its proper divisors (1).

222240217 is an equidigital number, since it uses as much as digits as its factorization.

222240217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 222240217 is about 14907.7234009758. The cubic root of 222240217 is about 605.7232131767.

Adding to 222240217 its reverse (712042222), we get a palindrome (934282439).

The spelling of 222240217 in words is "two hundred twenty-two million, two hundred forty thousand, two hundred seventeen".