43245021 has 4 divisors (see below), whose sum is σ = 57660032. Its totient is φ = 28830012.

The previous prime is 43245017. The next prime is 43245023. The reversal of 43245021 is 12054234.

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 not a de Polignac number, because 43245021 - 2² = 43245017 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 (43245023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7207501 + ... + 7207506.

It is an arithmetic number, because the mean of its divisors is an integer number (14415008).

Almost surely, 2^43245021 is an apocalyptic number.

It is an amenable number.

43245021 is a deficient number, since it is larger than the sum of its proper divisors (14415011).

43245021 is a wasteful number, since it uses less digits than its factorization.

43245021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14415010.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 43245021 is about 6576.0946617274. The cubic root of 43245021 is about 351.0039771954.

Adding to 43245021 its reverse (12054234), we get a palindrome (55299255).

The spelling of 43245021 in words is "forty-three million, two hundred forty-five thousand, twenty-one".