21010100

素因数分解:

$2^2\times 5^2\times {\mathrm{210101}}^1$

素因数の和:210115

約数の個数: 18

約数和(自身を含む): 45592134

約数和(自身を除く): 24582034

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 210101, 420202, 840404, 1050505, 2101010, 4202020, 5252525, 10505050, 21010100]

約数ペア:

[(1, 21010100), (2, 10505050), (4, 5252525), (5, 4202020), (10, 2101010), (20, 1050505), (25, 840404), (50, 420202), (100, 210101)]