43120321 has 4 divisors (see below), whose sum is σ = 43145172. Its totient is φ = 43095472.

The previous prime is 43120277. The next prime is 43120369. The reversal of 43120321 is 12302134.

It is a happy number.

43120321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25806400 + 17313921 = 5080^2 + 4161^2 .

It is a cyclic number.

It is not a de Polignac number, because 43120321 - 2⁹ = 43119809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43120295 and 43120304.

It is not an unprimeable number, because it can be changed into a prime (43124321) 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 in 3 ways as a sum of consecutive naturals, for example, 9610 + ... + 13363.

It is an arithmetic number, because the mean of its divisors is an integer number (10786293).

Almost surely, 2^43120321 is an apocalyptic number.

It is an amenable number.

43120321 is a deficient number, since it is larger than the sum of its proper divisors (24851).

43120321 is a wasteful number, since it uses less digits than its factorization.

43120321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24850.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 43120321 is about 6566.6065056466. The cubic root of 43120321 is about 350.6662709968. Note that the first 3 decimals are identical.

Adding to 43120321 its reverse (12302134), we get a palindrome (55422455).

The spelling of 43120321 in words is "forty-three million, one hundred twenty thousand, three hundred twenty-one".