20102105556 is a `hidden beast` number, since 2 + 0 + 1 + 0 + 2 + 105 + 556 = 666.
It is a congruent number.
It is an unprimeable number.
Almost surely, 220102105556 is an apocalyptic number.
20102105556 is a gapful number since it is divisible by the number (26) 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.
20102105556 is a wasteful number, since it uses less digits than its factorization.
20102105556 is an evil number, because the sum of its binary digits is even.
Adding to 20102105556 its reverse (65550120102), we get a palindrome (85652225658).
The spelling of 20102105556 in words is "twenty billion, one hundred two million, one hundred five thousand, five hundred fifty-six".