2yr old obsessed with letters, numbers, colors, etc.

So this is my youngest and none of my other kids were like this. I always thought videos of 2 year olds knowing their letters or counting were because parents were cramming flash cards at their children or something. 😂

But my little guy just turned 2 less than a month ago and is constantly reading letters, naming colors, counting numbers everywhere he sees them. And sometimes he just recites them to himself for no apparent reason. This morning I was still lying in bed when he started counting backwards. 😳 Does anyone else have a kid doing this? Or maybe has an older kid that did this and can tell me if they’ve had any problems in school. He seems perfectly normal in every other way.

I just don’t understand how he knows all this stuff when his 3yr old sister doesn’t know it. 🤯 They’ve been exposed to all the same information.

EDIT: To clarify he can count and identify numbers up to 100. He can identify all his letters, upper and lower case and will read out letters and numbers anywhere he sees them. He points at things and names their color. My other kids always struggled a bit with colors like black, gray, and brown, but he doesn’t.