11221181 has 2 divisors, whose sum is σ = 11221182. Its totient is φ = 11221180.

The previous prime is 11221159. The next prime is 11221187. The reversal of 11221181 is 18112211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11115556 + 105625 = 3334^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 11221181 - 2¹⁴ = 11204797 is a prime.

It is a super-2 number, since 2×11221181² = 251829806069522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11221187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610590 + 5610591.

It is an arithmetic number, because the mean of its divisors is an integer number (5610591).

Almost surely, 2^11221181 is an apocalyptic number.

It is an amenable number.

11221181 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221181 is an equidigital number, since it uses as much as digits as its factorization.

11221181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32, while the sum is 17.

The square root of 11221181 is about 3349.8031285435. The cubic root of 11221181 is about 223.8787409709.

Adding to 11221181 its reverse (18112211), we get a palindrome (29333392).

The spelling of 11221181 in words is "eleven million, two hundred twenty-one thousand, one hundred eighty-one".