43432440221 has 2 divisors, whose sum is σ = 43432440222. Its totient is φ = 43432440220.

The previous prime is 43432440211. The next prime is 43432440223. The reversal of 43432440221 is 12204423434.

43432440221 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., 25513672900 + 17918767321 = 159730^2 + 133861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43432440221 is a prime.

Together with 43432440223, 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 (43432440223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21716220110 + 21716220111.

It is an arithmetic number, because the mean of its divisors is an integer number (21716220111).

Almost surely, 2^43432440221 is an apocalyptic number.

It is an amenable number.

43432440221 is a deficient number, since it is larger than the sum of its proper divisors (1).

43432440221 is an equidigital number, since it uses as much as digits as its factorization.

43432440221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 43432440221 its reverse (12204423434), we get a palindrome (55636863655).

The spelling of 43432440221 in words is "forty-three billion, four hundred thirty-two million, four hundred forty thousand, two hundred twenty-one".