21001132200 has 96 divisors (see below), whose sum is σ = 66488780160. Its totient is φ = 5481139200.

The previous prime is 21001132199. The next prime is 21001132213. The reversal of 21001132200 is 223110012.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 344161 + ... + 400560.

It is an arithmetic number, because the mean of its divisors is an integer number (692591460).

Almost surely, 2^21001132200 is an apocalyptic number.

21001132200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001132200 is an abundant number, since it is smaller than the sum of its proper divisors (45487647960).

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

21001132200 is a wasteful number, since it uses less digits than its factorization.

21001132200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744787 (or 744778 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21001132200 its reverse (223110012), we get a palindrome (21224242212).

The spelling of 21001132200 in words is "twenty-one billion, one million, one hundred thirty-two thousand, two hundred".