43330921 has 2 divisors, whose sum is σ = 43330922. Its totient is φ = 43330920.

The previous prime is 43330877. The next prime is 43330933. The reversal of 43330921 is 12903334.

It is a happy number.

43330921 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., 34058896 + 9272025 = 5836^2 + 3045^2 .

It is a cyclic number.

It is not a de Polignac number, because 43330921 - 2⁹ = 43330409 is a prime.

It is not a weakly prime, because it can be changed into another prime (43330961) 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, 21665460 + 21665461.

It is an arithmetic number, because the mean of its divisors is an integer number (21665461).

Almost surely, 2^43330921 is an apocalyptic number.

It is an amenable number.

43330921 is a deficient number, since it is larger than the sum of its proper divisors (1).

43330921 is an equidigital number, since it uses as much as digits as its factorization.

43330921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 43330921 is about 6582.6226536237. The cubic root of 43330921 is about 351.2362297511.

The spelling of 43330921 in words is "forty-three million, three hundred thirty thousand, nine hundred twenty-one".