21489 ÷ 8 = 2686 R1
No problem, we've got 21489 and 8 for the division.

Step 1:
8 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 2 to get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 8

Step 2:
8 goes into 21 2 times with a remainder of 5.
Write down 2 as next digit of of the result. 
Result so far: 2
Subtract 16 from 21 to get 5.
Bring next digit (4) of the dividend behind the 5 and repeat the process: 54 / 8

Step 3:
8 goes into 54 6 times with a remainder of 6.
Write down 6 as next digit of of the result. 
Result so far: 26
Subtract 48 from 54 to get 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 8

Step 4:
8 goes into 68 8 times with a remainder of 4.
Write down 8 as next digit of of the result. 
Result so far: 268
Subtract 64 from 68 to get 4.
Bring next digit (9) of the dividend behind the 4 and repeat the process: 49 / 8

Step 5:
8 goes into 49 6 times with a remainder of 1.
Write down 6 as next digit of of the result. 
Result so far: 2686
Subtract 48 from 49 to get 1.

The final result is 2686 with a remainder of 1.