Adding to 51212 its reverse (21215), we get a palindrome (72427).
It is a plaindrome in base 12.
It is a nialpdrome in base 9.
It is a zygodrome in base 9.
51212 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
251212 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 51212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53760).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
51212 is a wasteful number, since it uses less digits than its factorization.
51212 is an odious number, because the sum of its binary digits is odd.
The square root of 51212 is about 226.3006849305. The cubic root of 51212 is about 37.1356114353.
The spelling of 51212 in words is "fifty-one thousand, two hundred twelve".