21101100200 has 48 divisors (see below), whose sum is σ = 49494270780. Its totient is φ = 8365736960.

The previous prime is 21101100193. The next prime is 21101100227. The reversal of 21101100200 is 200110112.

It can be written as a sum of positive squares in 6 ways, for example, as 62758084 + 21038342116 = 7922^2 + 145046^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 444239 + ... + 489438.

Almost surely, 2^21101100200 is an apocalyptic number.

21101100200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101100200 is an abundant number, since it is smaller than the sum of its proper divisors (28393170580).

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

21101100200 is a wasteful number, since it uses less digits than its factorization.

21101100200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933806 (or 933797 counting only the distinct ones).

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

Adding to 21101100200 its reverse (200110112), we get a palindrome (21301210312).

The spelling of 21101100200 in words is "twenty-one billion, one hundred one million, one hundred thousand, two hundred".