43045421 has 4 divisors (see below), whose sum is σ = 43374144. Its totient is φ = 42716700.

The previous prime is 43045417. The next prime is 43045427. The reversal of 43045421 is 12454034.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43045421 - 2² = 43045417 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 (43045427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164165 + ... + 164426.

It is an arithmetic number, because the mean of its divisors is an integer number (10843536).

Almost surely, 2^43045421 is an apocalyptic number.

It is an amenable number.

43045421 is a deficient number, since it is larger than the sum of its proper divisors (328723).

43045421 is a wasteful number, since it uses less digits than its factorization.

43045421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328722.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 43045421 is about 6560.9009289883. The cubic root of 43045421 is about 350.4631175481.

Adding to 43045421 its reverse (12454034), we get a palindrome (55499455).

The spelling of 43045421 in words is "forty-three million, forty-five thousand, four hundred twenty-one".