The Twenty-two Works of Creation.
Israel, the people, stands in closest relation to God, the Father, the Israelites being His beloved children (ch. i. 24 et seq., xix. 29). While all other nations are subject to angels or spirits appointed by Him as the Ruler of the world, Israel is subject only to God (comp. LXX. and Targ. Yer. to Deut. xxxii. 8). As a sign of its union with God, both the Sabbath and circumcision have been given to it, privileges which it shares with the angels (ch. ii. 18-21, xv. 26-27: "The two highest angelic orders have been created thus from the day of their creation"; comp. the passage concerning Adam and the rest of the world's saints [fifteen in number] having been born circumcised, derived from Gen. i. 27—"God created man in his own image" [Ab. R. N. ed. Schechter, p. 153]). Upon Jacob, as the end, the whole Creation is centered (ch. ii. 23, xix. 24-25), and the world's renewal is effected through the Messianic kingdom in Jerusalem (ch. i. 29, iv. 26). Accordingly, the twenty-two works of the six days of Creation are enumerated (ch. ii. 2-22): On the first day—heaven, earth, water, the spirits, the abyss, darkness, and light; on the second—the firmament; on the third—the land, the seas, vegetation, and paradise; on the fourth—sun, moon, and stars; on the fifth—the sea-monsters (Behemoth and Leviathan, "the first things of flesh created by His hands"), the fish, and the birds; on the sixth—the wild and the tame animals, the creeping things, and man; these twenty-two works correspond to the twenty-two generations from Adam to Jacob, as well as to the twenty-two letters of the alphabet and the twenty-two books of Holy Scripture (ch. ii. 23; comp. Midr. Tadshe vi.; Epstein, "Mi-Ḳadmoniyyot ha-Yehudim," 1887, p. xx.; and Charles, l.c. pp. 11, 18).
JUBILEES, BOOK OF - JewishEncyclopedia.com
The above demonstrates that an agenda was at work in the 22 enumeration. The 22 are not self-evident but result from necessity.