3321

Number
$3321$ (three thousand, three hundred and twenty-one) is:


 * $3^4 \times 41$


 * The $41$st hexagonal number after $1$, $6$, $15$, $28$, $45$, $66$, $91$, $\ldots$, $2145$, $2278$, $2415$, $2556$, $2701$, $2850$, $3003$, $3160$:
 * $3321 = \displaystyle \sum_{k \mathop = 1}^{41} \left({4 k - 3}\right) = 41 \left({2 \times 41 - 1}\right)$