Numbers / 101

The Number 101

101 is prime: only 1 and 101 divide it evenly; the next prime after 101 is 103. 101's proper divisors total just 1, 100 short of 101, the deficient case most of 101's neighbors share too. 101 is also a palindrome, since 101 reads identically forwards and backwards. 101 has a digit sum of 2; for 101, the digital root works out to 2. 101 shares no factor with 2-12; 101's own divisors start beyond that range. 101 is 1100101 in binary and 65 in hex; as a Roman numeral it's CI.