12221191 has 2 divisors, whose sum is σ = 12221192. Its totient is φ = 12221190.

The previous prime is 12221179. The next prime is 12221197. The reversal of 12221191 is 19112221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12221191 - 2¹⁷ = 12090119 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110595 + 6110596.

It is an arithmetic number, because the mean of its divisors is an integer number (6110596).

Almost surely, 2^12221191 is an apocalyptic number.

12221191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221191 is an equidigital number, since it uses as much as digits as its factorization.

12221191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 19.

The square root of 12221191 is about 3495.8820060179. The cubic root of 12221191 is about 230.3409624709.

The spelling of 12221191 in words is "twelve million, two hundred twenty-one thousand, one hundred ninety-one".