21044050403 has 16 divisors (see below), whose sum is σ = 22226899200. Its totient is φ = 19898325216.

The previous prime is 21044050387. The next prime is 21044050409. The reversal of 21044050403 is 30405044012.

It is not a de Polignac number, because 21044050403 - 2⁴ = 21044050387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21044050409) 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 15 ways as a sum of consecutive naturals, for example, 283376 + ... + 349842.

It is an arithmetic number, because the mean of its divisors is an integer number (1389181200).

Almost surely, 2^21044050403 is an apocalyptic number.

21044050403 is a deficient number, since it is larger than the sum of its proper divisors (1182848797).

21044050403 is a wasteful number, since it uses less digits than its factorization.

21044050403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66746.

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 21044050403 its reverse (30405044012), we get a palindrome (51449094415).

The spelling of 21044050403 in words is "twenty-one billion, forty-four million, fifty thousand, four hundred three".