Alright, let's work through 21451313 times 81060526 step by step
21451313 × 81060526 = 81060526 × (21451313)
+ 81060526 × 3 that equals 243181578
+ 81060526 × 10 resulting in 810605260
+ 81060526 × 300 that results in 24318157800
+ 81060526 × 1000 what gives us 81060526000
+ 81060526 × 50000 which equals 4053026300000
+ 81060526 × 400000 producing 32424210400000
+ 81060526 × 1000000 which equals 81060526000000
+ 81060526 × 20000000 that results in 1621210520000000

= 1738854715170638
