21304231440000 has 320 divisors, whose sum is σ = 72218663130240. Its totient is φ = 5560250368000.

The previous prime is 21304231439999. The next prime is 21304231440043. The reversal of 21304231440000 is 4413240312.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10335664 + ... + 12224336.

It is an arithmetic number, because the mean of its divisors is an integer number (225683322282).

Almost surely, 2^{21304231440000} is an apocalyptic number.

21304231440000 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 21304231440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36109331565120).

21304231440000 is an abundant number, since it is smaller than the sum of its proper divisors (50914431690240).

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

21304231440000 is an equidigital number, since it uses as much as digits as its factorization.

21304231440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888757 (or 1888730 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21304231440000 its reverse (4413240312), we get a palindrome (21308644680312).

The spelling of 21304231440000 in words is "twenty-one trillion, three hundred four billion, two hundred thirty-one million, four hundred forty thousand".