222121217 has 2 divisors, whose sum is σ = 222121218. Its totient is φ = 222121216.

The previous prime is 222121199. The next prime is 222121223. The reversal of 222121217 is 712121222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181467841 + 40653376 = 13471^2 + 6376^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121217 - 2¹⁴ = 222104833 is a prime.

It is a super-2 number, since 2×222121217² = 98675670083122178, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (222121247) 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, 111060608 + 111060609.

It is an arithmetic number, because the mean of its divisors is an integer number (111060609).

Almost surely, 2^222121217 is an apocalyptic number.

It is an amenable number.

222121217 is a deficient number, since it is larger than the sum of its proper divisors (1).

222121217 is an equidigital number, since it uses as much as digits as its factorization.

222121217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 224, while the sum is 20.

The square root of 222121217 is about 14903.7316468058. The cubic root of 222121217 is about 605.6150810355.

Adding to 222121217 its reverse (712121222), we get a palindrome (934242439).

The spelling of 222121217 in words is "two hundred twenty-two million, one hundred twenty-one thousand, two hundred seventeen".