Alright, let's work through 16486940 times 20921149 step by step
16486940 × 20921149 = 20921149 × (16486940)
+ 20921149 × 0 resulting in 0
+ 20921149 × 40 that results in 836845960
+ 20921149 × 900 resulting in 18829034100
+ 20921149 × 6000 that results in 125526894000
+ 20921149 × 80000 yielding 1673691920000
+ 20921149 × 400000 resulting in 8368459600000
+ 20921149 × 6000000 giving us 125526894000000
+ 20921149 × 10000000 which equals 209211490000000

= 344925728294060
