Adding to 20121120 its reverse (2112102), we get a palindrome (22233222).
It is a tau number, because it is divible by the number of its divisors (144).
Almost surely, 220121120 is an apocalyptic number.
20121120 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 20121120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34938540).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20121120 is a wasteful number, since it uses less digits than its factorization.
20121120 is an evil number, because the sum of its binary digits is even.
The square root of 20121120 is about 4485.6571424932. The cubic root of 20121120 is about 271.9886096730.
The spelling of 20121120 in words is "twenty million, one hundred twenty-one thousand, one hundred twenty".