21803056100 has 72 divisors (see below), whose sum is σ = 54429932928. Its totient is φ = 7425792000.

The previous prime is 21803056097. The next prime is 21803056129. The reversal of 21803056100 is 165030812.

It is a self number, because there is not a number n which added to its sum of digits gives 21803056100.

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, 2564 + ... + 208836.

Almost surely, 2^21803056100 is an apocalyptic number.

21803056100 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 21803056100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27214966464).

21803056100 is an abundant number, since it is smaller than the sum of its proper divisors (32626876828).

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

21803056100 is a wasteful number, since it uses less digits than its factorization.

21803056100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206445 (or 206438 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 21803056100 its reverse (165030812), we get a palindrome (21968086912).

The spelling of 21803056100 in words is "twenty-one billion, eight hundred three million, fifty-six thousand, one hundred".