21305002200 has 96 divisors (see below), whose sum is σ = 67656450960. Its totient is φ = 5542758400.

The previous prime is 21305002111. The next prime is 21305002211. The reversal of 21305002200 is 220050312.

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 21305002200.

It is a congruent number.

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, 408429 + ... + 457628.

Almost surely, 2^21305002200 is an apocalyptic number.

21305002200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21305002200 is an abundant number, since it is smaller than the sum of its proper divisors (46351448760).

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

21305002200 is a wasteful number, since it uses less digits than its factorization.

21305002200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866117 (or 866108 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

Adding to 21305002200 its reverse (220050312), we get a palindrome (21525052512).

The spelling of 21305002200 in words is "twenty-one billion, three hundred five million, two thousand, two hundred".