443440021 has 4 divisors (see below), whose sum is σ = 443508192. Its totient is φ = 443371852.

The previous prime is 443440009. The next prime is 443440057. The reversal of 443440021 is 120044344.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 443440021 - 2⁵ = 443439989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 443439974 and 443440001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (443440061) 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 in 3 ways as a sum of consecutive naturals, for example, 23161 + ... + 37726.

It is an arithmetic number, because the mean of its divisors is an integer number (110877048).

Almost surely, 2^443440021 is an apocalyptic number.

It is an amenable number.

443440021 is a deficient number, since it is larger than the sum of its proper divisors (68171).

443440021 is an equidigital number, since it uses as much as digits as its factorization.

443440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68170.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 443440021 is about 21058.0155997663. The cubic root of 443440021 is about 762.5675058392.

Adding to 443440021 its reverse (120044344), we get a palindrome (563484365).

The spelling of 443440021 in words is "four hundred forty-three million, four hundred forty thousand, twenty-one".