21200100001100 has 72 divisors (see below), whose sum is σ = 48636957608400. Its totient is φ = 7998640185600.

The previous prime is 21200100001097. The next prime is 21200100001123. The reversal of 21200100001100 is 110000100212.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23927231 + ... + 24797430.

Almost surely, 2^{21200100001100} is an apocalyptic number.

21200100001100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200100001100 is an abundant number, since it is smaller than the sum of its proper divisors (27436857607300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21200100001100 is a wasteful number, since it uses less digits than its factorization.

21200100001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48724923 (or 48724916 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21200100001100 its reverse (110000100212), we get a palindrome (21310100101312).

The spelling of 21200100001100 in words is "twenty-one trillion, two hundred billion, one hundred million, one thousand, one hundred".