monero 2021:
1.000.000.000.000 units per coin * 17.823.519 total coins == 17.823.519.000.000.000.000 total units
grin 2021:
1.000.000.000 units per coin * 64.119.049 total coins == 64.119.049.000.000.000 total units
grin 2049:
1.000.000.000 units per coin * 946.080.000 total coins == 946.080.000.000.000.000 total units
more than 17 times less grin, even after 30 years