21031312100200 has 384 divisors, whose sum is σ = 51937795768320. Its totient is φ = 7911669427200.

The previous prime is 21031312100177. The next prime is 21031312100209. The reversal of 21031312100200 is 200121313012.

It is not an unprimeable number, because it can be changed into a prime (21031312100209) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5869747609 + ... + 5869751191.

It is an arithmetic number, because the mean of its divisors is an integer number (135254676480).

Almost surely, 2^{21031312100200} is an apocalyptic number.

21031312100200 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 21031312100200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25968897884160).

21031312100200 is an abundant number, since it is smaller than the sum of its proper divisors (30906483668120).

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

21031312100200 is a wasteful number, since it uses less digits than its factorization.

21031312100200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3937 (or 3928 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21031312100200 its reverse (200121313012), we get a palindrome (21231433413212).

The spelling of 21031312100200 in words is "twenty-one trillion, thirty-one billion, three hundred twelve million, one hundred thousand, two hundred".