1123221217 has 2 divisors, whose sum is σ = 1123221218. Its totient is φ = 1123221216.

The previous prime is 1123221179. The next prime is 1123221221. The reversal of 1123221217 is 7121223211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1119839296 + 3381921 = 33464^2 + 1839^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123221217 - 2¹⁵ = 1123188449 is a prime.

It is a super-2 number, since 2×1123221217² = 2523251804637922178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1123221817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561610608 + 561610609.

It is an arithmetic number, because the mean of its divisors is an integer number (561610609).

Almost surely, 2^1123221217 is an apocalyptic number.

It is an amenable number.

1123221217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123221217 is an equidigital number, since it uses as much as digits as its factorization.

1123221217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 22.

The square root of 1123221217 is about 33514.4926412440. The cubic root of 1123221217 is about 1039.4934715940.

Adding to 1123221217 its reverse (7121223211), we get a palindrome (8244444428).

The spelling of 1123221217 in words is "one billion, one hundred twenty-three million, two hundred twenty-one thousand, two hundred seventeen".