21043444334 has 16 divisors (see below), whose sum is σ = 34775668656. Its totient is φ = 9470496000.

The previous prime is 21043444333. The next prime is 21043444337. The reversal of 21043444334 is 43344434012.

It is a self number, because there is not a number n which added to its sum of digits gives 21043444334.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043444333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4733027 + ... + 4737470.

It is an arithmetic number, because the mean of its divisors is an integer number (2173479291).

Almost surely, 2^21043444334 is an apocalyptic number.

21043444334 is a deficient number, since it is larger than the sum of its proper divisors (13732224322).

21043444334 is a wasteful number, since it uses less digits than its factorization.

21043444334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9470611.

The product of its (nonzero) digits is 55296, while the sum is 32.

Adding to 21043444334 its reverse (43344434012), we get a palindrome (64387878346).

The spelling of 21043444334 in words is "twenty-one billion, forty-three million, four hundred forty-four thousand, three hundred thirty-four".