The question contains a unit error: "litters" refers to solid waste (or animal births), not liquid volume. The correct unit is liters (or cubic meters, gallons, acre-feet).
~323,600,000 km³ = 3.236 × 1017 m³ = 3.236 × 1020 liters
That's 323.6 quintillion liters (323,600,000,000,000,000,000 L).
Ocean volume measurements underpin climate models (heat capacity), sea-level rise projections, carbon cycle calculations, and planetary water budgets. "Litters" would imply trash—which the Atlantic tragically also contains (~8M metric tons plastic/year). But its water is measured in liters. Quintillions of them.