444401021 has 2 divisors, whose sum is σ = 444401022. Its totient is φ = 444401020.

The previous prime is 444400981. The next prime is 444401033. The reversal of 444401021 is 120104444.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 300640921 + 143760100 = 17339^2 + 11990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-444401021 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 444400984 and 444401002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (444401921) 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, 222200510 + 222200511.

It is an arithmetic number, because the mean of its divisors is an integer number (222200511).

Almost surely, 2^444401021 is an apocalyptic number.

It is an amenable number.

444401021 is a deficient number, since it is larger than the sum of its proper divisors (1).

444401021 is an equidigital number, since it uses as much as digits as its factorization.

444401021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 444401021 is about 21080.8211652203. The cubic root of 444401021 is about 763.1179738418.

Adding to 444401021 its reverse (120104444), we get a palindrome (564505465).

The spelling of 444401021 in words is "four hundred forty-four million, four hundred one thousand, twenty-one".