43944221 has 2 divisors, whose sum is σ = 43944222. Its totient is φ = 43944220.

The previous prime is 43944211. The next prime is 43944223. The reversal of 43944221 is 12244934.

43944221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31483321 + 12460900 = 5611^2 + 3530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43944221 is a prime.

Together with 43944223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43944223) 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 as a sum of consecutive naturals, namely, 21972110 + 21972111.

It is an arithmetic number, because the mean of its divisors is an integer number (21972111).

Almost surely, 2^43944221 is an apocalyptic number.

It is an amenable number.

43944221 is a deficient number, since it is larger than the sum of its proper divisors (1).

43944221 is an equidigital number, since it uses as much as digits as its factorization.

43944221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 29.

The square root of 43944221 is about 6629.0437470272. The cubic root of 43944221 is about 352.8855891612.

The spelling of 43944221 in words is "forty-three million, nine hundred forty-four thousand, two hundred twenty-one".