• 102 can be written using four 4's:
102 is nontrivially palindromic in base 16.
102 is an esthetic number in base 4 and base 9, because in such bases its adjacent digits differ by 1.
It is a sphenic number, since it is the product of 3 distinct primes.
102 is an admirable number.
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
102 is an idoneal number.
It is an Ulam number.
102 is an undulating number in base 4.
102 is a nontrivial repdigit in base 16.
It is a plaindrome in base 8, base 9, base 13, base 15 and base 16.
It is a nialpdrome in base 11, base 12, base 14 and base 16.
It is a zygodrome in base 16.
It is a congruent number.
In principle, a polygon with 102 sides can be constructed with ruler and compass.
102 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
102 is a wasteful number, since it uses less digits than its factorization.
102 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 22.
The square root of 102 is about 10.0995049384. The cubic root of 102 is about 4.6723287284.
Adding to 102 its reverse (201), we get a palindrome (303).
Subtracting 102 from its reverse (201), we obtain a palindrome (99).
Multiplying 102 by its reverse (201), we get a palindrome (20502).