Consider the letters in the words "HALF LIFE THREE" and the usual
conversion table:

Write the letters on 3 columns:

But there is more! Consider:

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A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 |

Write the letters on 3 columns:

H | A | L | = | 8 | 01 | 12 | = | 80112 |

F | L | I | = | 6 | 12 | 09 | = | 61209 |

F | E | T | = | 6 | 05 | 20 | = | 60520 |

H | R | E | = | 8 | 18 | 05 | = | 81805 |

E | - | - | = | 5 | 00 | 00 | = | 50000 |

•
The sum of last column numbers is 333646,
whose reverse is 646333.

•
Subtracting from 646333 the product of its digits
3888 we get 642445,

• whose product of digits is
6
×
4
×
2 ×
4 ×
4 ×
5
=
3840.

•
Swapping the first two digits of
3840 with the last two we get
4038.

•
Finally,
4038 =
2019
+
2 and
2019 + 2
= 2021.

But there is more! Consider:

H | A | L | = | 8 | + | 1 | + | 12 | = | 21 |

F | L | I | = | 6 | + | 12 | + | 9 | = | 27 |

F | E | 3 | = | 6 | + | 5 | + | 3 | = | 14 |

• The sum of the numbers in the last
column is 21 +
27 +
14
= 62, and

• the 62-nd prime number is 293.

• Multiplying 293 to the sum of its digits 2+9+3 we get 4102.

• The reverse of 4102 is 2014.

• Finally,
2014
+
2+0+1+4
=
2021.