21044052005 has 16 divisors (see below), whose sum is σ = 26081812080. Its totient is φ = 16291312128.

The previous prime is 21044051971. The next prime is 21044052017. The reversal of 21044052005 is 50025044012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1423326529 + 19620725476 = 37727^2 + 140074^2 .

It is a cyclic number.

It is not a de Polignac number, because 21044052005 - 2¹⁰ = 21044050981 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, 524570 + ... + 563259.

It is an arithmetic number, because the mean of its divisors is an integer number (1630113255).

Almost surely, 2^21044052005 is an apocalyptic number.

It is an amenable number.

21044052005 is a deficient number, since it is larger than the sum of its proper divisors (5037760075).

21044052005 is a wasteful number, since it uses less digits than its factorization.

21044052005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087960.

The product of its (nonzero) digits is 1600, while the sum is 23.

Adding to 21044052005 its reverse (50025044012), we get a palindrome (71069096017).

The spelling of 21044052005 in words is "twenty-one billion, forty-four million, fifty-two thousand, five".