43066421 has 4 divisors (see below), whose sum is σ = 44551500. Its totient is φ = 41581344.

The previous prime is 43066417. The next prime is 43066433. The reversal of 43066421 is 12466034.

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 7365796 + 35700625 = 2714^2 + 5975^2 .

It is a cyclic number.

It is not a de Polignac number, because 43066421 - 2² = 43066417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43066481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 742496 + ... + 742553.

It is an arithmetic number, because the mean of its divisors is an integer number (11137875).

Almost surely, 2^43066421 is an apocalyptic number.

It is an amenable number.

43066421 is a deficient number, since it is larger than the sum of its proper divisors (1485079).

43066421 is a wasteful number, since it uses less digits than its factorization.

43066421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485078.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 43066421 is about 6562.5011238094. The cubic root of 43066421 is about 350.5201002173.

The spelling of 43066421 in words is "forty-three million, sixty-six thousand, four hundred twenty-one".