21200100212100 has 36 divisors (see below), whose sum is σ = 61338956614544. Its totient is φ = 5653360056480.

The previous prime is 21200100212087. The next prime is 21200100212101. The reversal of 21200100212100 is 121200100212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (21200100212101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35333500054 + ... + 35333500653.

Almost surely, 2^{21200100212100} is an apocalyptic number.

21200100212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200100212100 is an abundant number, since it is smaller than the sum of its proper divisors (40138856402444).

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

21200100212100 is a wasteful number, since it uses less digits than its factorization.

21200100212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70667000724 (or 70667000717 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21200100212100 its reverse (121200100212), we get a palindrome (21321300312312).

The spelling of 21200100212100 in words is "twenty-one trillion, two hundred billion, one hundred million, two hundred twelve thousand, one hundred".