43427021 has 6 divisors (see below), whose sum is σ = 47733966. Its totient is φ = 39479000.

The previous prime is 43426987. The next prime is 43427029. The reversal of 43427021 is 12072434.

43427021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 43414921 + 12100 = 6589^2 + 110^2 .

It is not a de Polignac number, because 43427021 - 2¹⁰ = 43425997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43427029) 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 5 ways as a sum of consecutive naturals, for example, 179330 + ... + 179571.

It is an arithmetic number, because the mean of its divisors is an integer number (7955661).

Almost surely, 2^43427021 is an apocalyptic number.

It is an amenable number.

43427021 is a deficient number, since it is larger than the sum of its proper divisors (4306945).

43427021 is a wasteful number, since it uses less digits than its factorization.

43427021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358923 (or 358912 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 43427021 is about 6589.9181330271. The cubic root of 43427021 is about 351.4956971119.

Adding to 43427021 its reverse (12072434), we get a palindrome (55499455).

The spelling of 43427021 in words is "forty-three million, four hundred twenty-seven thousand, twenty-one".