21211100200 has 48 divisors (see below), whose sum is σ = 50462707680. Its totient is φ = 8287124160.

The previous prime is 21211100159. The next prime is 21211100203. The reversal of 21211100200 is 200111212.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21211100203) 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, 1224604 + ... + 1241803.

It is an arithmetic number, because the mean of its divisors is an integer number (1051306410).

Almost surely, 2^21211100200 is an apocalyptic number.

21211100200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211100200 is an abundant number, since it is smaller than the sum of its proper divisors (29251607480).

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

21211100200 is a wasteful number, since it uses less digits than its factorization.

21211100200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2466466 (or 2466457 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21211100200 its reverse (200111212), we get a palindrome (21411211412).

The spelling of 21211100200 in words is "twenty-one billion, two hundred eleven million, one hundred thousand, two hundred".