twenty-one

https://tts.langeek.co/read?text=dHdlbnR5LW9uZQ&hash=3a7a10feae9fb3294241152c2ddf0fc6f63c1189&lang=en&cache-only=0

Here you will find the vocabulary from Unit 1 - 1B in the English Result Elementary coursebook, such as "twenty-three", "seventy", "hundred", etc.