4921

Number
$4921$ (four thousand, nine hundred and twenty-one) is:


 * $7 \times 19 \times 37$


 * The $41$st centered hexagonal number after $1, 7, 19, 37, 61, 91, 127, \ldots, 2791, 2977, 3169, 3367, 3571, 3781, 3997, 4219, 4447, 4681$:
 * $4921 = \displaystyle 1 + \sum_{k \mathop = 1}^{41 - 1} 6 k = 41^3 - 40^3$