Adding to 100122121100 its reverse (1121221001), we get a palindrome (101243342101).
Subtracting from 100122121100 its reverse (1121221001), we obtain a palindrome (99000900099).
It is an unprimeable number.
Almost surely, 2100122121100 is an apocalyptic number.
100122121100 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 100122121100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113639382864).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
100122121100 is a wasteful number, since it uses less digits than its factorization.
100122121100 is an evil number, because the sum of its binary digits is even.
The spelling of 100122121100 in words is "one hundred billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred".