Adding to 121770 its reverse (77121), we get a palindrome (198891).
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 121770.
It is an unprimeable number.
2121770 is an apocalyptic number.
121770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is a practical number, because each smaller number is the sum of distinct divisors of 121770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181440).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
121770 is a wasteful number, since it uses less digits than its factorization.
121770 is an odious number, because the sum of its binary digits is odd.
The square root of 121770 is about 348.9555845663. The cubic root of 121770 is about 49.5655696711.
The spelling of 121770 in words is "one hundred twenty-one thousand, seven hundred seventy", and thus it is an iban number.