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_21422977_2 ( ministers VARCHAR, cabinet__nickname_ VARCHAR )

### Question ###
How many ministers are there when the cabinet (nickname) is Steingr mur Hermannsson III?

### Accurate SQL ###

SELECT ministers FROM table_21422977_2 WHERE cabinet__nickname_ = "Steingrímur Hermannsson III"