From SourceryForge

The Number 11

11 is a Prime Number

Reduction of digits: 1 + 1 = 2

The Justice is card number 11 of the Major Arcarna in the Golden Dawn tradition, and the popular Rider Waite Deck. In the older decks following the Tarot de Marseilles tradition, Strength is number 11. This change was made because it makes Justice correspond to Libra instead to Leo, which seems more fitting. There exist many newer decks with both orders.

Numbers under 1000 which reduce to 11

29, 38, 47, 56, 65, 74, 83, 92, 119, 128, 137, 146, 155, 164, 173, 182, 191, 209, 218, 227, 236, 245, 254, 263, 272, 281, 290, 308, 317, 326, 335, 344, 353, 362, 371, 380, 407, 416, 425, 434, 443, 452, 461, 470, 506, 515, 524, 533, 542, 551, 560, 605, 614, 623, 632, 641, 650, 704, 713, 722, 731, 740, 803, 812, 821, 830, 902, 911, 920.