Adding to 121500 its reverse (5121), we get a palindrome (126621).
It is a happy number.
It is a congruent number.
2121500 is an apocalyptic number.
121500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 121500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198744).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
121500 is an equidigital number, since it uses as much as digits as its factorization.
121500 is an evil number, because the sum of its binary digits is even.
The square root of 121500 is about 348.5685011587. The cubic root of 121500 is about 49.5289087334.
The spelling of 121500 in words is "one hundred twenty-one thousand, five hundred".