44440021 has 4 divisors (see below), whose sum is σ = 44470944. Its totient is φ = 44409100.

The previous prime is 44440007. The next prime is 44440037. The reversal of 44440021 is 12004444.

44440021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 44440021 - 2⁹ = 44439509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44440061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13195 + ... + 16216.

It is an arithmetic number, because the mean of its divisors is an integer number (11117736).

Almost surely, 2^44440021 is an apocalyptic number.

It is an amenable number.

44440021 is a deficient number, since it is larger than the sum of its proper divisors (30923).

44440021 is a wasteful number, since it uses less digits than its factorization.

44440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30922.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 44440021 is about 6666.3349000782. The cubic root of 44440021 is about 354.2077711431.

Adding to 44440021 its reverse (12004444), we get a palindrome (56444465).

The spelling of 44440021 in words is "forty-four million, four hundred forty thousand, twenty-one".