Adding to 22121011110020 its reverse (2001111012122), we get a palindrome (24122122122142).
It is an unprimeable number.
Almost surely, 222121011110020 is an apocalyptic number.
22121011110020 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 pseudoperfect number, because it is the sum of a subset of its proper divisors.
22121011110020 is a wasteful number, since it uses less digits than its factorization.
22121011110020 is an evil number, because the sum of its binary digits is even.
The spelling of 22121011110020 in words is "twenty-two trillion, one hundred twenty-one billion, eleven million, one hundred ten thousand, twenty".