21130312200 has 48 divisors (see below), whose sum is σ = 65503969680. Its totient is φ = 5634749760.

The previous prime is 21130312157. The next prime is 21130312211. The reversal of 21130312200 is 221303112.

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 21130312200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17607994 + ... + 17609193.

It is an arithmetic number, because the mean of its divisors is an integer number (1364666035).

Almost surely, 2^21130312200 is an apocalyptic number.

21130312200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21130312200 is an abundant number, since it is smaller than the sum of its proper divisors (44373657480).

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

21130312200 is a wasteful number, since it uses less digits than its factorization.

21130312200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35217206 (or 35217197 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21130312200 its reverse (221303112), we get a palindrome (21351615312).

The spelling of 21130312200 in words is "twenty-one billion, one hundred thirty million, three hundred twelve thousand, two hundred".