21000200200 has 96 divisors (see below), whose sum is σ = 55829640960. Its totient is φ = 7196313600.

The previous prime is 21000200153. The next prime is 21000200251. The reversal of 21000200200 is 200200012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (7).

21000200200 is a modest number, since divided by 200200 gives 21000 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4703169 + ... + 4707631.

It is an arithmetic number, because the mean of its divisors is an integer number (581558760).

Almost surely, 2^21000200200 is an apocalyptic number.

21000200200 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 21000200200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27914820480).

21000200200 is an abundant number, since it is smaller than the sum of its proper divisors (34829440760).

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

21000200200 is a wasteful number, since it uses less digits than its factorization.

21000200200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7847 (or 7838 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

Adding to 21000200200 its reverse (200200012), we get a palindrome (21200400212).

The spelling of 21000200200 in words is "twenty-one billion, two hundred thousand, two hundred".