The given number is 22471 The unit digit of 2. ⇒21=2 ⇒22=4 ⇒23=8 ⇒24=6 ⇒25=2 Here, the digit is repeating after every 4th power. Now, ⇒22471=22468×223=(224)117×223 The unit digit of expression (224)117×223 ⇒(224)117×223=6×2×2×2=8 Hence, the unit digit of 22471= 8.