21011221

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{131}}^1\times {\mathrm{2083}}^1$

素因数の和:2232

約数の個数: 16

約数和(自身を含む): 26408448

約数和(自身を除く): 5397227

約数列:

[1, 7, 11, 77, 131, 917, 1441, 2083, 10087, 14581, 22913, 160391, 272873, 1910111, 3001603, 21011221]

約数ペア:

[(1, 21011221), (7, 3001603), (11, 1910111), (77, 272873), (131, 160391), (917, 22913), (1441, 14581), (2083, 10087)]