4044444221 has 4 divisors (see below), whose sum is σ = 4143089244. Its totient is φ = 3945799200.

The previous prime is 4044444203. The next prime is 4044444227. The reversal of 4044444221 is 1224444404.

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 1129632100 + 2914812121 = 33610^2 + 53989^2 .

It is a cyclic number.

It is not a de Polignac number, because 4044444221 - 2²⁶ = 3977335357 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 (4044444227) 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, 49322450 + ... + 49322531.

It is an arithmetic number, because the mean of its divisors is an integer number (1035772311).

Almost surely, 2^4044444221 is an apocalyptic number.

4044444221 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4044444221 is a deficient number, since it is larger than the sum of its proper divisors (98645023).

4044444221 is an equidigital number, since it uses as much as digits as its factorization.

4044444221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98645022.

The product of its (nonzero) digits is 16384, while the sum is 29.

The square root of 4044444221 is about 63595.9450043790. The cubic root of 4044444221 is about 1593.2586441601.

Adding to 4044444221 its reverse (1224444404), we get a palindrome (5268888625).

The spelling of 4044444221 in words is "four billion, forty-four million, four hundred forty-four thousand, two hundred twenty-one".