21204239995 has 8 divisors (see below), whose sum is σ = 26941857984. Its totient is φ = 15965545344.

The previous prime is 21204239977. The next prime is 21204240011. The reversal of 21204239995 is 59993240212.

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 21204239995 - 2⁵ = 21204239963 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124730739 + ... + 124730908.

It is an arithmetic number, because the mean of its divisors is an integer number (3367732248).

Almost surely, 2^21204239995 is an apocalyptic number.

21204239995 is a deficient number, since it is larger than the sum of its proper divisors (5737617989).

21204239995 is a wasteful number, since it uses less digits than its factorization.

21204239995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249461669.

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 21204239995 in words is "twenty-one billion, two hundred four million, two hundred thirty-nine thousand, nine hundred ninety-five".