Adding to 2120121200 its reverse (21210212), we get a palindrome (2141331412).
It is a happy number.
It is a congruent number.
It is an unprimeable number.
Almost surely, 22120121200 is an apocalyptic number.
2120121200 is a gapful number since it is divisible by the number (20) 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 2120121200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2603464320).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2120121200 is a wasteful number, since it uses less digits than its factorization.
2120121200 is an evil number, because the sum of its binary digits is even.
The square root of 2120121200 is about 46044.7738619705. The cubic root of 2120121200 is about 1284.6561379625.
The spelling of 2120121200 in words is "two billion, one hundred twenty million, one hundred twenty-one thousand, two hundred".