21100010200 has 96 divisors (see below), whose sum is σ = 50133621600. Its totient is φ = 8255836160.

The previous prime is 21100010177. The next prime is 21100010213. The reversal of 21100010200 is 201000112.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 3738981 + ... + 3744619.

It is an arithmetic number, because the mean of its divisors is an integer number (522225225).

Almost surely, 2^21100010200 is an apocalyptic number.

21100010200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21100010200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25066810800).

21100010200 is an abundant number, since it is smaller than the sum of its proper divisors (29033611400).

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

21100010200 is a wasteful number, since it uses less digits than its factorization.

21100010200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6061 (or 6052 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21100010200 its reverse (201000112), we get a palindrome (21301010312).

The spelling of 21100010200 in words is "twenty-one billion, one hundred million, ten thousand, two hundred".