21200012100200 has 48 divisors (see below), whose sum is σ = 49356726756000. Its totient is φ = 8468529808320.

The previous prime is 21200012100193. The next prime is 21200012100209. The reversal of 21200012100200 is 200121000212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21200012100209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71570780 + ... + 71866379.

It is an arithmetic number, because the mean of its divisors is an integer number (1028265140750).

Almost surely, 2^{21200012100200} is an apocalyptic number.

21200012100200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200012100200 is an abundant number, since it is smaller than the sum of its proper divisors (28156714655800).

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

21200012100200 is a wasteful number, since it uses less digits than its factorization.

21200012100200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143437914 (or 143437905 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21200012100200 its reverse (200121000212), we get a palindrome (21400133100412).

The spelling of 21200012100200 in words is "twenty-one trillion, two hundred billion, twelve million, one hundred thousand, two hundred".