21231103200 has 288 divisors, whose sum is σ = 72499359744. Its totient is φ = 5390346240.

The previous prime is 21231103183. The next prime is 21231103211. The reversal of 21231103200 is 230113212.

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 21231103200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4171057 + ... + 4176143.

It is an arithmetic number, because the mean of its divisors is an integer number (251733888).

Almost surely, 2^21231103200 is an apocalyptic number.

21231103200 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 21231103200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36249679872).

21231103200 is an abundant number, since it is smaller than the sum of its proper divisors (51268256544).

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

21231103200 is a wasteful number, since it uses less digits than its factorization.

21231103200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5194 (or 5181 counting only the distinct ones).

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

Adding to 21231103200 its reverse (230113212), we get a palindrome (21461216412).

The spelling of 21231103200 in words is "twenty-one billion, two hundred thirty-one million, one hundred three thousand, two hundred".