Alright, let's work through 21052002 times 51244553 step by step
21052002 × 51244553 = 51244553 × (21052002)
+ 51244553 × 2 what gives us 102489106
+ 51244553 × 00 resulting in 0
+ 51244553 × 000 resulting in 0
+ 51244553 × 2000 that equals 102489106000
+ 51244553 × 50000 that results in 2562227650000
+ 51244553 × 000000 resulting in 0
+ 51244553 × 1000000 what gives us 51244553000000
+ 51244553 × 20000000 which equals 1024891060000000

= 1078800432245106
