44000021 has 4 divisors (see below), whose sum is σ = 47384652. Its totient is φ = 40615392.

The previous prime is 44000009. The next prime is 44000023. The reversal of 44000021 is 12000044.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9060100 + 34939921 = 3010^2 + 5911^2 .

It is a cyclic number.

It is not a de Polignac number, because 44000021 - 2⁶ = 43999957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 43999966 and 44000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44000023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1692296 + ... + 1692321.

It is an arithmetic number, because the mean of its divisors is an integer number (11846163).

Almost surely, 2^44000021 is an apocalyptic number.

It is an amenable number.

44000021 is a deficient number, since it is larger than the sum of its proper divisors (3384631).

44000021 is a wasteful number, since it uses less digits than its factorization.

44000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3384630.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 44000021 is about 6633.2511636452. The cubic root of 44000021 is about 353.0348896972.

Adding to 44000021 its reverse (12000044), we get a palindrome (56000065).

The spelling of 44000021 in words is "forty-four million, twenty-one", and thus it is an aban number.