44430021 has 12 divisors (see below), whose sum is σ = 65229580. Its totient is φ = 29134080.

The previous prime is 44430017. The next prime is 44430031. The reversal of 44430021 is 12003444.

It can be written as a sum of positive squares in 2 ways, for example, as 13793796 + 30636225 = 3714^2 + 5535^2 .

It is not a de Polignac number, because 44430021 - 2² = 44430017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 44429976 and 44430003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44430011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39916 + ... + 41013.

Almost surely, 2^44430021 is an apocalyptic number.

It is an amenable number.

44430021 is a deficient number, since it is larger than the sum of its proper divisors (20799559).

44430021 is a wasteful number, since it uses less digits than its factorization.

44430021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80996 (or 80993 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 44430021 is about 6665.5848205540. The cubic root of 44430021 is about 354.1812009230.

Adding to 44430021 its reverse (12003444), we get a palindrome (56433465).

The spelling of 44430021 in words is "forty-four million, four hundred thirty thousand, twenty-one".