21174399568321 has 8 divisors (see below), whose sum is σ = 21187011005888. Its totient is φ = 21161788650000.

The previous prime is 21174399568261. The next prime is 21174399568367. The reversal of 21174399568321 is 12386599347112.

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 21174399568321 - 2¹⁹ = 21174399044033 is a prime.

It is a super-2 number, since 2×21174399568321² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21174399568321.

It is not an unprimeable number, because it can be changed into a prime (21174399563321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108072196 + ... + 108267946.

It is an arithmetic number, because the mean of its divisors is an integer number (2648376375736).

Almost surely, 2^{21174399568321} is an apocalyptic number.

It is an amenable number.

21174399568321 is a deficient number, since it is larger than the sum of its proper divisors (12611437567).

21174399568321 is a wasteful number, since it uses less digits than its factorization.

21174399568321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259623.

The product of its digits is 19595520, while the sum is 61.

The spelling of 21174399568321 in words is "twenty-one trillion, one hundred seventy-four billion, three hundred ninety-nine million, five hundred sixty-eight thousand, three hundred twenty-one".