Adding to 1100111221100 its reverse (11221110011), we get a palindrome (1111332331111).
It is a zygodrome in base 10.
It is an unprimeable number.
Almost surely, 21100111221100 is an apocalyptic number.
1100111221100 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.
1100111221100 is a wasteful number, since it uses less digits than its factorization.
1100111221100 is an evil number, because the sum of its binary digits is even.
The spelling of 1100111221100 in words is "one trillion, one hundred billion, one hundred eleven million, two hundred twenty-one thousand, one hundred".