21104231200 has 144 divisors (see below), whose sum is σ = 55995869160. Its totient is φ = 7720427520.

The previous prime is 21104231189. The next prime is 21104231201. The reversal of 21104231200 is 213240112.

It can be written as a sum of positive squares in 12 ways, for example, as 4307034384 + 16797196816 = 65628^2 + 129604^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21104231201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1124292 + ... + 1142908.

Almost surely, 2^21104231200 is an apocalyptic number.

21104231200 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 21104231200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27997934580).

21104231200 is an abundant number, since it is smaller than the sum of its proper divisors (34891637960).

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

21104231200 is a wasteful number, since it uses less digits than its factorization.

21104231200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18759 (or 18746 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21104231200 its reverse (213240112), we get a palindrome (21317471312).

It can be divided in two parts, 211042 and 31200, that added together give a palindrome (242242).

The spelling of 21104231200 in words is "twenty-one billion, one hundred four million, two hundred thirty-one thousand, two hundred".