hello I use licensed ccleaner on mobile. Can I use the same license on my computer?
If it is CCleaner for Android bought/registered through the google store then no, it will be a subscription activated through google and you will not have a licence key.
(That's just the way that the google store works).
So in that case you will need to purchase a licence key to register CCleaner on a PC or Mac.
However if you have purchased a multi-device CCleaner Pro Plus, or CCleaner Premium, licence from the CCleaner website then that key can be used to activate/register CCleaner in Android rather than subscribing through the google store.