According to the Secretary of State of California, as of October 22, 2012, Marin County has 155,025 registered voters, out of 176,604 eligible (87.78%). Of those, 84,374 (54.43%) are registered Democrats, 28,458 (18.36%) are registered California Republican Party, 7,000 (4.51%) are registered with other political parties, and 35,193 (22.70%) have Decline to State a political party. Democrats hold wide voter-registration majorities in all political subdivisions in Marin County, except for the affluent city of Belvedere, California, in which Democrats only hold a 60-vote (3.95%) registration advantage. Democrats largest registration advantage in Marin is in the town of Fairfax, California, wherein there are only 391 Republicans (7.2%) out of 5,441 total voters compared to 3,496 Democrats (64.25%) and 1,145 voters who have declined to state a political party (21.04%).
Question: How many of Marin County's eligible voters are not registered?
Answer: 21579