21103303200 has 144 divisors (see below), whose sum is σ = 78504350400. Its totient is φ = 4823608320.

The previous prime is 21103303187. The next prime is 21103303201. The reversal of 21103303200 is 230330112.

It is a super-2 number, since 2×21103303200² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21103303200.

It is not an unprimeable number, because it can be changed into a prime (21103303201) by changing a digit.

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, 611275 + ... + 644874.

It is an arithmetic number, because the mean of its divisors is an integer number (545169100).

Almost surely, 2^21103303200 is an apocalyptic number.

21103303200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103303200 is an abundant number, since it is smaller than the sum of its proper divisors (57401047200).

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

21103303200 is a wasteful number, since it uses less digits than its factorization.

21103303200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256179 (or 1256166 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21103303200 its reverse (230330112), we get a palindrome (21333633312).

The spelling of 21103303200 in words is "twenty-one billion, one hundred three million, three hundred three thousand, two hundred".