440000221 has 2 divisors, whose sum is σ = 440000222. Its totient is φ = 440000220.

The previous prime is 440000219. The next prime is 440000227. The reversal of 440000221 is 122000044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 413105625 + 26894596 = 20325^2 + 5186^2 .

It is a cyclic number.

It is not a de Polignac number, because 440000221 - 2¹ = 440000219 is a prime.

Together with 440000219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440000227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220000110 + 220000111.

It is an arithmetic number, because the mean of its divisors is an integer number (220000111).

Almost surely, 2^440000221 is an apocalyptic number.

It is an amenable number.

440000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

440000221 is an equidigital number, since it uses as much as digits as its factorization.

440000221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 440000221 is about 20976.1822312832. The cubic root of 440000221 is about 760.5906194935.

Adding to 440000221 its reverse (122000044), we get a palindrome (562000265).

The spelling of 440000221 in words is "four hundred forty million, two hundred twenty-one", and thus it is an aban number.