Adding to 121312 its reverse (213121), we get a palindrome (334433).
Subtracting 121312 from its reverse (213121), we obtain a square (91809 = 3032).
It is a plaindrome in base 6.
It is a congruent number.
2121312 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 121312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127008).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
121312 is a wasteful number, since it uses less digits than its factorization.
121312 is an odious number, because the sum of its binary digits is odd.
The square root of 121312 is about 348.2987223634. The cubic root of 121312 is about 49.5033497716.
The spelling of 121312 in words is "one hundred twenty-one thousand, three hundred twelve", and thus it is an iban number.