21,576
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Number
$21 \, 576$ (twenty-one thousand, five hundred and seventy-six) is:
- $2^3 \times 3 \times 29 \times 31$
- The area of The smallest Pythagorean quadrilateral in which the sides of the $4$ right triangles formed by its sides and perpendicular diagonals are all integers
Also see
Sources
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $21,576$