21866838516717 has 8 divisors (see below), whose sum is σ = 29160580861440. Its totient is φ = 14575494258240.

The previous prime is 21866838516707. The next prime is 21866838516749. The reversal of 21866838516717 is 71761583866812.

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

It is not a de Polignac number, because 21866838516717 - 2¹⁴ = 21866838500333 is a prime.

It is a super-3 number, since 3×21866838516717³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21866838516707) by changing a digit.

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, 599500284 + ... + 599536757.

It is an arithmetic number, because the mean of its divisors is an integer number (3645072607680).

Almost surely, 2^{21866838516717} is an apocalyptic number.

It is an amenable number.

21866838516717 is a deficient number, since it is larger than the sum of its proper divisors (7293742344723).

21866838516717 is a wasteful number, since it uses less digits than its factorization.

21866838516717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199043123.

The product of its digits is 162570240, while the sum is 69.

The spelling of 21866838516717 in words is "twenty-one trillion, eight hundred sixty-six billion, eight hundred thirty-eight million, five hundred sixteen thousand, seven hundred seventeen".