Go to:
https://blockchain.info/en/address/12c6DSiU4Rq3P4ZxziKxzrL5L...
Scroll down to the bottom, where you will see:
https://blockchain.info/tx/0e3e2357e806b6cdb1f70b54c3a3a17b6...
That is the genesis block.
(Well, OK, that's the transaction contained in the genesis block. The Genesis block itself is https://blockchain.info/block-index/14850)
> Also how do you know it is Sataoshi's?
Because he was the only one mining when bitcoin launched.