11318221 has 2 divisors, whose sum is σ = 11318222. Its totient is φ = 11318220.

The previous prime is 11318213. The next prime is 11318227. The reversal of 11318221 is 12281311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8185321 + 3132900 = 2861^2 + 1770^2 .

It is a cyclic number.

It is not a de Polignac number, because 11318221 - 2³ = 11318213 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11318227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5659110 + 5659111.

It is an arithmetic number, because the mean of its divisors is an integer number (5659111).

Almost surely, 2^11318221 is an apocalyptic number.

It is an amenable number.

11318221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11318221 is an equidigital number, since it uses as much as digits as its factorization.

11318221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 19.

The square root of 11318221 is about 3364.2563814311. The cubic root of 11318221 is about 224.5222521482.

Adding to 11318221 its reverse (12281311), we get a palindrome (23599532).

The spelling of 11318221 in words is "eleven million, three hundred eighteen thousand, two hundred twenty-one".