4 × 3.14 × 21! 4 × 3.14 × 21!
Answer: 641,702,233,676,670,592,000,0004 3.14 21! =4 3.14 1 2 3 … 20 21 =4 3.14 51,090,942,171,709,440,000 =12.56 51,090,942,171,709,440,000 =641,702,233,676,670,592,000,000 = \(6.41702233676670592 * 10^{20}\)