19921 ÷ 1 = 19921 R0
Sure thing! Let's divide 19921 by 1 together.

Step 1:
1 goes into 1 1 times with a remainder of 0.
Write down 1 as next digit of of the result. 
Result so far: 1
Subtract 1 from 1 to get 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 1

Step 2:
1 goes into 9 9 times with a remainder of 0.
Write down 9 as next digit of of the result. 
Result so far: 19
Subtract 9 from 9 to get 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 1

Step 3:
1 goes into 9 9 times with a remainder of 0.
Write down 9 as next digit of of the result. 
Result so far: 199
Subtract 9 from 9 to get 0.
Bring next digit (2) of the dividend behind the 0 and repeat the process: 2 / 1

Step 4:
1 goes into 2 2 times with a remainder of 0.
Write down 2 as next digit of of the result. 
Result so far: 1992
Subtract 2 from 2 to get 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 1

Step 5:
1 goes into 1 1 times with a remainder of 0.
Write down 1 as next digit of of the result. 
Result so far: 19921
Subtract 1 from 1 to get 0.

The final result is 19921 with a remainder of 0.