43329421 has 2 divisors, whose sum is σ = 43329422. Its totient is φ = 43329420.

The previous prime is 43329371. The next prime is 43329427. The reversal of 43329421 is 12492334.

43329421 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., 24502500 + 18826921 = 4950^2 + 4339^2 .

It is a cyclic number.

It is not a de Polignac number, because 43329421 - 2¹⁷ = 43198349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43329421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43329427) 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, 21664710 + 21664711.

It is an arithmetic number, because the mean of its divisors is an integer number (21664711).

Almost surely, 2^43329421 is an apocalyptic number.

It is an amenable number.

43329421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43329421 is an equidigital number, since it uses as much as digits as its factorization.

43329421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 28.

The square root of 43329421 is about 6582.5087162874. The cubic root of 43329421 is about 351.2321767529.

The spelling of 43329421 in words is "forty-three million, three hundred twenty-nine thousand, four hundred twenty-one".