11163221 has 2 divisors, whose sum is σ = 11163222. Its totient is φ = 11163220.

The previous prime is 11163199. The next prime is 11163223. The reversal of 11163221 is 12236111.

11163221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10982596 + 180625 = 3314^2 + 425^2 .

It is an emirp because it is prime and its reverse (12236111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11163221 is a prime.

It is a Sophie Germain prime.

Together with 11163223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11163221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11163223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5581610 + 5581611.

It is an arithmetic number, because the mean of its divisors is an integer number (5581611).

Almost surely, 2^11163221 is an apocalyptic number.

It is an amenable number.

11163221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11163221 is an equidigital number, since it uses as much as digits as its factorization.

11163221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 17.

The square root of 11163221 is about 3341.1406734826. The cubic root of 11163221 is about 223.4926135354.

Adding to 11163221 its reverse (12236111), we get a palindrome (23399332).

The spelling of 11163221 in words is "eleven million, one hundred sixty-three thousand, two hundred twenty-one".