12211217 has 2 divisors, whose sum is σ = 12211218. Its totient is φ = 12211216.

The previous prime is 12211193. The next prime is 12211223. The reversal of 12211217 is 71211221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11498881 + 712336 = 3391^2 + 844^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211217 - 2¹² = 12207121 is a prime.

It is a super-2 number, since 2×12211217² = 298227641242178, which contains 22 as substring.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 12211195 and 12211204.

It is not a weakly prime, because it can be changed into another prime (12211817) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105608 + 6105609.

It is an arithmetic number, because the mean of its divisors is an integer number (6105609).

Almost surely, 2^12211217 is an apocalyptic number.

It is an amenable number.

12211217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211217 is an equidigital number, since it uses as much as digits as its factorization.

12211217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56, while the sum is 17.

The square root of 12211217 is about 3494.4551792805. The cubic root of 12211217 is about 230.2782831997.

Adding to 12211217 its reverse (71211221), we get a palindrome (83422438).

The spelling of 12211217 in words is "twelve million, two hundred eleven thousand, two hundred seventeen".