22221191 has 2 divisors, whose sum is σ = 22221192. Its totient is φ = 22221190.

The previous prime is 22221181. The next prime is 22221209. The reversal of 22221191 is 19112222.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22221191 - 2²² = 18026887 is a prime.

It is a Sophie Germain prime.

It is equal to p_1402238 and since 22221191 and 1402238 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22221161) 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, 11110595 + 11110596.

It is an arithmetic number, because the mean of its divisors is an integer number (11110596).

Almost surely, 2^22221191 is an apocalyptic number.

22221191 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221191 is an equidigital number, since it uses as much as digits as its factorization.

22221191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 20.

The square root of 22221191 is about 4713.9358290074. The cubic root of 22221191 is about 281.1398728674.

The spelling of 22221191 in words is "twenty-two million, two hundred twenty-one thousand, one hundred ninety-one".