Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_23445 ( "Index (Year)" text, "Author / Editor / Source" text, "Year of publication" text, "Countries sampled" real, "World Ranking (1)" text, "Ranking L.A. (2)" text )

### Question ###
How many items were under ranking l.a.(2) when the world ranking was 21st?

### Accurate SQL ###

SELECT COUNT("Ranking L.A. (2)") FROM table_23445 WHERE "World Ranking (1)" = '21st'