12221089 has 2 divisors, whose sum is σ = 12221090. Its totient is φ = 12221088.

The previous prime is 12221087. The next prime is 12221107. The reversal of 12221089 is 98012221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11785489 + 435600 = 3433^2 + 660^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221089 - 2¹ = 12221087 is a prime.

Together with 12221087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12221087) 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, 6110544 + 6110545.

It is an arithmetic number, because the mean of its divisors is an integer number (6110545).

Almost surely, 2^12221089 is an apocalyptic number.

It is an amenable number.

12221089 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221089 is an equidigital number, since it uses as much as digits as its factorization.

12221089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 12221089 is about 3495.8674173944. The cubic root of 12221089 is about 230.3403216484.

The spelling of 12221089 in words is "twelve million, two hundred twenty-one thousand, eighty-nine".