222123217 has 2 divisors, whose sum is σ = 222123218. Its totient is φ = 222123216.

The previous prime is 222123191. The next prime is 222123221. The reversal of 222123217 is 712321222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221682321 + 440896 = 14889^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 222123217 - 2¹⁹ = 221598929 is a prime.

It is not a weakly prime, because it can be changed into another prime (222123257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111061608 + 111061609.

It is an arithmetic number, because the mean of its divisors is an integer number (111061609).

Almost surely, 2^222123217 is an apocalyptic number.

It is an amenable number.

222123217 is a deficient number, since it is larger than the sum of its proper divisors (1).

222123217 is an equidigital number, since it uses as much as digits as its factorization.

222123217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 22.

The square root of 222123217 is about 14903.7987439444. The cubic root of 222123217 is about 605.6168987014.

Adding to 222123217 its reverse (712321222), we get a palindrome (934444439).

The spelling of 222123217 in words is "two hundred twenty-two million, one hundred twenty-three thousand, two hundred seventeen".