43442240221 has 4 divisors (see below), whose sum is σ = 43442716032. Its totient is φ = 43441764412.

The previous prime is 43442240203. The next prime is 43442240287. The reversal of 43442240221 is 12204224434.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 43442240221 - 2⁵ = 43442240189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43442240221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43442240021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53101 + ... + 299506.

It is an arithmetic number, because the mean of its divisors is an integer number (10860679008).

Almost surely, 2^43442240221 is an apocalyptic number.

It is an amenable number.

43442240221 is a deficient number, since it is larger than the sum of its proper divisors (475811).

43442240221 is a wasteful number, since it uses less digits than its factorization.

43442240221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475810.

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 43442240221 its reverse (12204224434), we get a palindrome (55646464655).

The spelling of 43442240221 in words is "forty-three billion, four hundred forty-two million, two hundred forty thousand, two hundred twenty-one".