Adding to 121220022000 its reverse (220022121), we get a palindrome (121440044121).
It is a congruent number.
It is an unprimeable number.
Almost surely, 2121220022000 is an apocalyptic number.
121220022000 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 121220022000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247980949632).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
121220022000 is a wasteful number, since it uses less digits than its factorization.
121220022000 is an evil number, because the sum of its binary digits is even.
The spelling of 121220022000 in words is "one hundred twenty-one billion, two hundred twenty million, twenty-two thousand".