221044289 has 2 divisors, whose sum is σ = 221044290. Its totient is φ = 221044288.

The previous prime is 221044223. The next prime is 221044339. The reversal of 221044289 is 982440122.

It is a happy number.

221044289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139051264 + 81993025 = 11792^2 + 9055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221044289 is a prime.

It is not a weakly prime, because it can be changed into another prime (221044589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110522144 + 110522145.

It is an arithmetic number, because the mean of its divisors is an integer number (110522145).

Almost surely, 2^221044289 is an apocalyptic number.

It is an amenable number.

221044289 is a deficient number, since it is larger than the sum of its proper divisors (1).

221044289 is an equidigital number, since it uses as much as digits as its factorization.

221044289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 221044289 is about 14867.5582729647. The cubic root of 221044289 is about 604.6347443540.

The spelling of 221044289 in words is "two hundred twenty-one million, forty-four thousand, two hundred eighty-nine".