21031113200 has 120 divisors (see below), whose sum is σ = 52811255280. Its totient is φ = 8038195200.

The previous prime is 21031113179. The next prime is 21031113223. The reversal of 21031113200 is 231113012.

It is a congruent number.

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, 1115855 + ... + 1134545.

It is an arithmetic number, because the mean of its divisors is an integer number (440093794).

Almost surely, 2^21031113200 is an apocalyptic number.

21031113200 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 21031113200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26405627640).

21031113200 is an abundant number, since it is smaller than the sum of its proper divisors (31780142080).

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

21031113200 is a wasteful number, since it uses less digits than its factorization.

21031113200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18835 (or 18824 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21031113200 its reverse (231113012), we get a palindrome (21262226212).

The spelling of 21031113200 in words is "twenty-one billion, thirty-one million, one hundred thirteen thousand, two hundred".