Exhibit 99.21 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-M KEY PERFORMANCE FACTORS May 31, 2001 Expected B Maturity 10/15/02 Blended Coupon 4.8637% Excess Protection Level 3 Month Average 7.59% May, 2001 7.20% April, 2001 7.85% March, 2001 7.72% Cash Yield 19.68% Investor Charge Offs 5.45% Base Rate 7.03% Over 30 Day Delinquency 4.84% Seller's Interest 8.52% Total Payment Rate 14.20% Total Principal Balance $58,203,705,030.43 Investor Participation Amount $750,000,000.00 Seller Participation Amount $4,958,014,468.94