1404440221 has 2 divisors, whose sum is σ = 1404440222. Its totient is φ = 1404440220.

The previous prime is 1404440209. The next prime is 1404440231. The reversal of 1404440221 is 1220444041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1039095225 + 365344996 = 32235^2 + 19114^2 .

It is an emirp because it is prime and its reverse (1220444041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1404440221 - 2⁹ = 1404439709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1404440192 and 1404440201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1404440201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702220110 + 702220111.

It is an arithmetic number, because the mean of its divisors is an integer number (702220111).

Almost surely, 2^1404440221 is an apocalyptic number.

It is an amenable number.

1404440221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1404440221 is an equidigital number, since it uses as much as digits as its factorization.

1404440221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 1404440221 is about 37475.8618446594. The cubic root of 1404440221 is about 1119.8703668522.

Adding to 1404440221 its reverse (1220444041), we get a palindrome (2624884262).

The spelling of 1404440221 in words is "one billion, four hundred four million, four hundred forty thousand, two hundred twenty-one".