user: Question: What is the average Election, when % Of Prefectural Vote is 38.57%, and when # Of Prefectural Votes is greater than 21114727?
Columns: ['Election', 'Leader', '# of seats won', '# of National votes', '% of National vote', '# of Prefectural votes', '% of Prefectural vote']
Types: ['real', 'text', 'real', 'real', 'text', 'real', 'text']
Sample row: [1956.0, 'Ichirō Hatoyama', 61.0, 11356874.0, '39.7%', 14353960.0, '48.4%']
SQL:

assistant: SELECT AVG("Election") FROM "Table" WHERE "% of Prefectural vote" = '38.57%' AND "# of Prefectural votes" > 21114727.0;