21044320005 has 16 divisors (see below), whose sum is σ = 35134865280. Its totient is φ = 10735652928.

The previous prime is 21044319979. The next prime is 21044320027. The reversal of 21044320005 is 50002344012.

It is not a de Polignac number, because 21044320005 - 2²⁰ = 21043271429 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30498670 + ... + 30499359.

It is an arithmetic number, because the mean of its divisors is an integer number (2195929080).

Almost surely, 2^21044320005 is an apocalyptic number.

It is an amenable number.

21044320005 is a deficient number, since it is larger than the sum of its proper divisors (14090545275).

21044320005 is a wasteful number, since it uses less digits than its factorization.

21044320005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60998060.

The product of its (nonzero) digits is 960, while the sum is 21.

Adding to 21044320005 its reverse (50002344012), we get a palindrome (71046664017).

The spelling of 21044320005 in words is "twenty-one billion, forty-four million, three hundred twenty thousand, five".