2107

Number
$2107$ (two thousand, one hundred and seven) is:
 * $7^2 \times 43$


 * The $27$th centered hexagonal number after $1, 7, 19, 37, 61, 91, 127, \ldots, 817, 919, 1027, 1141, 1261, 1387, 1519, 1657, 1801, 1951$:
 * $2107 = \displaystyle 1 + \sum_{k \mathop = 1}^{27 - 1} 6 k = 27^3 - 26^3$