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_name_40 ( _inns VARCHAR, player VARCHAR, wickets VARCHAR )

### Question ###
How many 5+/inns have tyron henderson as the player, with wickets less than 21?

### Accurate SQL ###

SELECT COUNT(5) + _inns FROM table_name_40 WHERE player = "tyron henderson" AND wickets < 21