Table:
text: 2000 PGA Tour
Tournament results
Tournament results
Date_ Tournament Location_ Winner Score _1st_prize_
Apr 30 Shell Houston Open Texas Robert Allenby (1) 275 (–13) 504000
May 7 Compaq Classic of New Orleans Louisiana Carlos Franco (3) 270 (–18) 612000
May 14 GTE Byron Nelson Classic Texas Jesper Parnevik (4) 269 (–11) 720000
May 21 MasterCard Colonial Texas Phil Mickelson (16) 268 (–12) 594000
May 29 The Memorial Tournament Ohio Tiger Woods (19) 269 (–19) 558000
Jun 4 Kemper Insurance Open Maryland Tom Scherrer (1) 271 (–13) 540000
Jun 11 Buick Classic New York Dennis Paulson (1) 276 (–8) 540000
Jun 18 U.S. Open California Tiger Woods (20) 272 (–12) 800000
Jun 25 FedEx St. Jude Classic Tennessee Notah Begay III (3) 271 (–13) 540000

Question: What is 1st prize for the 2000 PGA Tour on May 21st?