21201122200 has 24 divisors (see below), whose sum is σ = 49292609580. Its totient is φ = 8480448800.

The previous prime is 21201122197. The next prime is 21201122207. The reversal of 21201122200 is 222110212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201122207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53002606 + ... + 53003005.

Almost surely, 2^21201122200 is an apocalyptic number.

21201122200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201122200 is an abundant number, since it is smaller than the sum of its proper divisors (28091487380).

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

21201122200 is a wasteful number, since it uses less digits than its factorization.

21201122200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106005627 (or 106005618 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21201122200 its reverse (222110212), we get a palindrome (21423232412).

The spelling of 21201122200 in words is "twenty-one billion, two hundred one million, one hundred twenty-two thousand, two hundred".