It is a congruent number.
It is an unprimeable number.
2121700 is an apocalyptic number.
121700 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 pseudoperfect number, because it is the sum of a subset of its proper divisors.
121700 is a wasteful number, since it uses less digits than its factorization.
121700 is an evil number, because the sum of its binary digits is even.
The square root of 121700 is about 348.8552708502. The cubic root of 121700 is about 49.5560701914.
Adding to 121700 its reverse (7121), we get a palindrome (128821).
The spelling of 121700 in words is "one hundred twenty-one thousand, seven hundred", and thus it is an iban number.