43243021 has 2 divisors, whose sum is σ = 43243022. Its totient is φ = 43243020.

The previous prime is 43242977. The next prime is 43243027. The reversal of 43243021 is 12034234.

43243021 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., 22184100 + 21058921 = 4710^2 + 4589^2 .

It is a cyclic number.

It is not a de Polignac number, because 43243021 - 2⁷ = 43242893 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43243021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43243027) 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, 21621510 + 21621511.

It is an arithmetic number, because the mean of its divisors is an integer number (21621511).

Almost surely, 2^43243021 is an apocalyptic number.

It is an amenable number.

43243021 is a deficient number, since it is larger than the sum of its proper divisors (1).

43243021 is an equidigital number, since it uses as much as digits as its factorization.

43243021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 43243021 is about 6575.9425940317. The cubic root of 43243021 is about 350.9985660231.

Adding to 43243021 its reverse (12034234), we get a palindrome (55277255).

The spelling of 43243021 in words is "forty-three million, two hundred forty-three thousand, twenty-one".