21331200000 has 576 divisors, whose sum is σ = 78311862720. Its totient is φ = 5120000000.

The previous prime is 21331199977. The next prime is 21331200029. The reversal of 21331200000 is 213312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 211199950 + ... + 211200050.

It is an arithmetic number, because the mean of its divisors is an integer number (135958095).

Almost surely, 2^21331200000 is an apocalyptic number.

21331200000 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 21331200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39155931360).

21331200000 is an abundant number, since it is smaller than the sum of its proper divisors (56980662720).

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

21331200000 is an equidigital number, since it uses as much as digits as its factorization.

21331200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21331200000 its reverse (213312), we get a palindrome (21331413312).

21331200000 divided by its reverse (213312) gives a 5-th power (100000 = 10⁵).

It can be divided in two parts, 213 and 31200000, that added together give a palindrome (31200213).

The spelling of 21331200000 in words is "twenty-one billion, three hundred thirty-one million, two hundred thousand".