Most pianos have 88 keys. You can get small pianos with 76 keys and large pianos with as many as 97 keys, but most pianos have 88.
36 white. 25 black. In total 61 if i did my math right. keys are also the levers that you press to provide the sound of the correct notes
Also, some small toy electric keyboards have as little as 21
There are 88 keys on a standard piano.
Older pianos may have more or less, but they are non-standard.