21044044203 has 32 divisors (see below), whose sum is σ = 34542154752. Its totient is φ = 11097475200.

The previous prime is 21044044199. The next prime is 21044044237. The reversal of 21044044203 is 30244044012.

It is a happy number.

It is not a de Polignac number, because 21044044203 - 2² = 21044044199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21044044243) 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 31 ways as a sum of consecutive naturals, for example, 1692138 + ... + 1704528.

It is an arithmetic number, because the mean of its divisors is an integer number (1079442336).

Almost surely, 2^21044044203 is an apocalyptic number.

21044044203 is a deficient number, since it is larger than the sum of its proper divisors (13498110549).

21044044203 is a wasteful number, since it uses less digits than its factorization.

21044044203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18635.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21044044203 its reverse (30244044012), we get a palindrome (51288088215).

The spelling of 21044044203 in words is "twenty-one billion, forty-four million, forty-four thousand, two hundred three".