221044009 has 2 divisors, whose sum is σ = 221044010. Its totient is φ = 221044008.

The previous prime is 221043989. The next prime is 221044027. The reversal of 221044009 is 900440122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125552025 + 95491984 = 11205^2 + 9772^2 .

It is a cyclic number.

It is not a de Polignac number, because 221044009 - 2⁹ = 221043497 is a prime.

It is not a weakly prime, because it can be changed into another prime (221044069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110522004 + 110522005.

It is an arithmetic number, because the mean of its divisors is an integer number (110522005).

Almost surely, 2^221044009 is an apocalyptic number.

It is an amenable number.

221044009 is a deficient number, since it is larger than the sum of its proper divisors (1).

221044009 is an equidigital number, since it uses as much as digits as its factorization.

221044009 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 22.

The square root of 221044009 is about 14867.5488564861. The cubic root of 221044009 is about 604.6344890540.

The spelling of 221044009 in words is "two hundred twenty-one million, forty-four thousand, nine".