21044315504 has 20 divisors (see below), whose sum is σ = 43171794864. Its totient is φ = 9903207168.

The previous prime is 21044315491. The next prime is 21044315557. The reversal of 21044315504 is 40551344012.

It is a congruent number.

It is an unprimeable number.

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, 38684132 + ... + 38684675.

Almost surely, 2^21044315504 is an apocalyptic number.

It is an amenable number.

21044315504 is an abundant number, since it is smaller than the sum of its proper divisors (22127479360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21044315504 is a wasteful number, since it uses less digits than its factorization.

21044315504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77368832 (or 77368826 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 21044315504 its reverse (40551344012), we get a palindrome (61595659516).

The spelling of 21044315504 in words is "twenty-one billion, forty-four million, three hundred fifteen thousand, five hundred four".