43424130221 has 4 divisors (see below), whose sum is σ = 43444226844. Its totient is φ = 43404033600.

The previous prime is 43424130187. The next prime is 43424130247. The reversal of 43424130221 is 12203142434.

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 36628600996 + 6795529225 = 191386^2 + 82435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43424130221 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 (43424130271) 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, 10045070 + ... + 10049391.

It is an arithmetic number, because the mean of its divisors is an integer number (10861056711).

Almost surely, 2^43424130221 is an apocalyptic number.

It is an amenable number.

43424130221 is a deficient number, since it is larger than the sum of its proper divisors (20096623).

43424130221 is a wasteful number, since it uses less digits than its factorization.

43424130221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20096622.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 43424130221 its reverse (12203142434), we get a palindrome (55627272655).

The spelling of 43424130221 in words is "forty-three billion, four hundred twenty-four million, one hundred thirty thousand, two hundred twenty-one".