user: Question: In what urban area is the 2011 population 21561? 
Columns: ['Rank 2011', 'Change since 2006', 'Urban Area', 'County', 'Population 2011', 'Increase since 2006']
Types: ['real', 'text', 'text', 'text', 'real', 'text']
Sample row: [1.0, '0', 'Dublin', 'County Dublin', 1110627.0, '6.2%']
SQL:

assistant: SELECT "Urban Area" FROM "Table" WHERE "Population 2011" = 21561.0;