11321220217 has 2 divisors, whose sum is σ = 11321220218. Its totient is φ = 11321220216.

The previous prime is 11321220109. The next prime is 11321220221. The reversal of 11321220217 is 71202212311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9397169721 + 1924050496 = 96939^2 + 43864^2 .

It is an emirp because it is prime and its reverse (71202212311) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11321220217 is a prime.

It is not a weakly prime, because it can be changed into another prime (11321220277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5660610108 + 5660610109.

It is an arithmetic number, because the mean of its divisors is an integer number (5660610109).

Almost surely, 2^11321220217 is an apocalyptic number.

It is an amenable number.

11321220217 is a deficient number, since it is larger than the sum of its proper divisors (1).

11321220217 is an equidigital number, since it uses as much as digits as its factorization.

11321220217 is an evil number, because the sum of its binary digits is even.

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

Adding to 11321220217 its reverse (71202212311), we get a palindrome (82523432528).

The spelling of 11321220217 in words is "eleven billion, three hundred twenty-one million, two hundred twenty thousand, two hundred seventeen".