21040340005 has 8 divisors (see below), whose sum is σ = 25249197600. Its totient is φ = 16831745616.

The previous prime is 21040339997. The next prime is 21040340017. The reversal of 21040340005 is 50004304012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21040340005 - 2³ = 21040339997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235486 + ... + 312304.

It is an arithmetic number, because the mean of its divisors is an integer number (3156149700).

Almost surely, 2^21040340005 is an apocalyptic number.

It is an amenable number.

21040340005 is a deficient number, since it is larger than the sum of its proper divisors (4208857595).

21040340005 is an equidigital number, since it uses as much as digits as its factorization.

21040340005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131603.

The product of its (nonzero) digits is 480, while the sum is 19.

Adding to 21040340005 its reverse (50004304012), we get a palindrome (71044644017).

The spelling of 21040340005 in words is "twenty-one billion, forty million, three hundred forty thousand, five".