21004410005 has 4 divisors (see below), whose sum is σ = 25205292012. Its totient is φ = 16803528000.

The previous prime is 21004409977. The next prime is 21004410013. The reversal of 21004410005 is 50001440012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2497800484 + 18506609521 = 49978^2 + 136039^2 .

It is not a de Polignac number, because 21004410005 - 2¹⁰ = 21004408981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2100440996 + ... + 2100441005.

It is an arithmetic number, because the mean of its divisors is an integer number (6301323003).

Almost surely, 2^21004410005 is an apocalyptic number.

It is an amenable number.

21004410005 is a deficient number, since it is larger than the sum of its proper divisors (4200882007).

21004410005 is an equidigital number, since it uses as much as digits as its factorization.

21004410005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200882006.

The product of its (nonzero) digits is 160, while the sum is 17.

Adding to 21004410005 its reverse (50001440012), we get a palindrome (71005850017).

The spelling of 21004410005 in words is "twenty-one billion, four million, four hundred ten thousand, five".