11822221 has 2 divisors, whose sum is σ = 11822222. Its totient is φ = 11822220.

The previous prime is 11822201. The next prime is 11822231. The reversal of 11822221 is 12222811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10634121 + 1188100 = 3261^2 + 1090^2 .

It is an emirp because it is prime and its reverse (12222811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11822221 - 2⁵ = 11822189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11822201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5911110 + 5911111.

It is an arithmetic number, because the mean of its divisors is an integer number (5911111).

Almost surely, 2^11822221 is an apocalyptic number.

It is an amenable number.

11822221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11822221 is an equidigital number, since it uses as much as digits as its factorization.

11822221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128, while the sum is 19.

The square root of 11822221 is about 3438.3456777933. The cubic root of 11822221 is about 227.8066291610.

It can be divided in two parts, 1182 and 2221, that added together give a triangular number (3403 = T₈₂).

The spelling of 11822221 in words is "eleven million, eight hundred twenty-two thousand, two hundred twenty-one".