21440324005 has 16 divisors (see below), whose sum is σ = 26580939264. Its totient is φ = 16584834240.

The previous prime is 21440323999. The next prime is 21440324011. The reversal of 21440324005 is 50042304412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21440323999) and next prime (21440324011).

It is not a de Polignac number, because 21440324005 - 2⁵ = 21440323973 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 15 ways as a sum of consecutive naturals, for example, 125719 + ... + 242251.

It is an arithmetic number, because the mean of its divisors is an integer number (1661308704).

Almost surely, 2^21440324005 is an apocalyptic number.

It is an amenable number.

21440324005 is a deficient number, since it is larger than the sum of its proper divisors (5140615259).

21440324005 is a wasteful number, since it uses less digits than its factorization.

21440324005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117756.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21440324005 its reverse (50042304412), we get a palindrome (71482628417).

The spelling of 21440324005 in words is "twenty-one billion, four hundred forty million, three hundred twenty-four thousand, five".