That is a reduction of 0.7% compared to March, when unemployment reached 21.6%.
On the year, unemployment was up 1.8%.
This was the second consecutive month that unemployment had gone down.
The DZS recently reported that 355,598 unemployed persons were registered with the Employment Service at the end of April.
Daily figures released on the Employment Service website indicated that 338,905 people were unemployed last Wednesday.