21011000200 has 96 divisors (see below), whose sum is σ = 50668542720. Its totient is φ = 8094240000.

The previous prime is 21011000183. The next prime is 21011000207. The reversal of 21011000200 is 200011012.

It is not an unprimeable number, because it can be changed into a prime (21011000207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1300170 + ... + 1316230.

It is an arithmetic number, because the mean of its divisors is an integer number (527797320).

Almost surely, 2^21011000200 is an apocalyptic number.

21011000200 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 21011000200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25334271360).

21011000200 is an abundant number, since it is smaller than the sum of its proper divisors (29657542520).

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

21011000200 is a wasteful number, since it uses less digits than its factorization.

21011000200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16319 (or 16310 counting only the distinct ones).

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

Adding to 21011000200 its reverse (200011012), we get a palindrome (21211011212).

The spelling of 21011000200 in words is "twenty-one billion, eleven million, two hundred", and thus it is an aban number.