Alright, let's work through 75381681 times 86102821 step by step
75381681 × 86102821 = 86102821 × (75381681)
+ 86102821 × 1 resulting in 86102821
+ 86102821 × 80 which equals 6888225680
+ 86102821 × 600 that is equal 51661692600
+ 86102821 × 1000 yielding 86102821000
+ 86102821 × 80000 that equals 6888225680000
+ 86102821 × 300000 giving us 25830846300000
+ 86102821 × 5000000 that equals 430514105000000
+ 86102821 × 70000000 that is equal 6027197470000000

= 6490575385822101
