2 is a number following 1 and preceding 3. it is one of the only eight digits that is not in the binary computer system, the other seven are 3, 4, 5, 6, 7, 8, and 9. it also is the sum of 11. and is the answer of 1 + 1.

2 is one of the 16 hexadecimal digits. the other 15 are 0, 1, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, and F.

2 is also one of the five numbers closest to 0. the other four are 1, 3, 4, and 5.

decanumbers with 2 in it are 12, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 32, 42, 52, 62, 72, 82, and 92.

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