21661
This number is a prime.
The prime number 21661 can be obtained with the quadratic
form 2x^2-4x+31, where x = 105. [Sandri]
There are 18 cases of the nth distinct digit brilliant
number being divisible by n. The largest is the 21661st
(430815629) being divisible by 21661. [Gaydos]
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