Find the missing number in the following series

Q21. 24, 340, 2194, 6856, ?

1. 23892
2. 24386
3. 18926
4. 22445

Q22. 2, 12, 36, 80, 150, ?

1. 256
2. 228
3. 252
4. 264

Q23. 6, ?, 62, 123, 214, 341

1. 11
2. 25
3. 36
4. 47

Q24. 1, 4, ?, 256, 3125

1. 6
2. 9
3. 11
4. 27

Q25. 350, 222, 130, 68, 30, ?

1. 12
2. 15
3. 10
4. 2

Q26. 0, 7, 26, ?, 124, 215

1. 35
2. 52
3. 63
4. 74

Q27. 2, 3, 2, 15, ?, 245

1. 44
2. 74
3. 54
4. 144

Q28. 0, 2, 8, 14, 24, 34, ?, 62

1. 40
2. 42
3. 48
4. 52

Q29. 6, 20, 36, 48, 50, ?, 0

1. 56
2. 46
3. 36
4. 48

Q30. 1, 16, 81, 256, 625, ?

1. 1296
2. 1225
3. 2225
4. 4163