Bluebulb Projects' The Measure of Things presents:
21,000 is about one-two-thousandth the number of people in The State of California.
In other words, it's 0.0005477 times the count of people in The State of California, and the count of people in The State of California is 1,826 times that amount.
(2014 figures) (Department of Finance estimate)
California, the most populous state in the United States, is home to 38,340,000 people (larger than the population of the entire country of Canada, with 35,540,419 people). Over ten percent of the population — 3,904,657 people — reside in the city of Los Angeles.