Alright, let's work through 21731471 times 90080763 step by step
21731471 × 90080763 = 90080763 × (21731471)
+ 90080763 × 1 giving us 90080763
+ 90080763 × 70 that is equal 6305653410
+ 90080763 × 400 that is equal 36032305200
+ 90080763 × 1000 which equals 90080763000
+ 90080763 × 30000 what gives us 2702422890000
+ 90080763 × 700000 that is equal 63056534100000
+ 90080763 × 1000000 that equals 90080763000000
+ 90080763 × 20000000 that equals 1801615260000000

= 1957587488792373
