10809221 has 2 divisors, whose sum is σ = 10809222. Its totient is φ = 10809220.

The previous prime is 10809179. The next prime is 10809259. The reversal of 10809221 is 12290801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10660225 + 148996 = 3265^2 + 386^2 .

It is an emirp because it is prime and its reverse (12290801) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10809221 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 (10809521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5404610 + 5404611.

It is an arithmetic number, because the mean of its divisors is an integer number (5404611).

Almost surely, 2^10809221 is an apocalyptic number.

It is an amenable number.

10809221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10809221 is an equidigital number, since it uses as much as digits as its factorization.

10809221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 10809221 is about 3287.7379761775. The cubic root of 10809221 is about 221.1047802723.

It can be divided in two parts, 1080 and 9221, that added together give a palindrome (10301).

The spelling of 10809221 in words is "ten million, eight hundred nine thousand, two hundred twenty-one".