The best replacement for 21st century is 20th century.

The best alternatives to 21st century are rated as following:
★★★★★  20th century
★★★★★  geico
★★★  allstate
★★  19th century
★★  21st century
★  18th century
★  esurance
★  twenty first century
★  century
★  liberty mutual
★  twenty-first century
  20th
  22nd century
  progressive insurance

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Google Trends

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21st century
20th century
geico