21231001320000 has 280 divisors, whose sum is σ = 71384407802400. Its totient is φ = 5565639168000.

The previous prime is 21231001319993. The next prime is 21231001320017. The reversal of 21231001320000 is 2310013212.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 5580636 + ... + 8579364.

It is an arithmetic number, because the mean of its divisors is an integer number (254944313580).

Almost surely, 2^{21231001320000} is an apocalyptic number.

21231001320000 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 21231001320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35692203901200).

21231001320000 is an abundant number, since it is smaller than the sum of its proper divisors (50153406482400).

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

21231001320000 is an equidigital number, since it uses as much as digits as its factorization.

21231001320000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2998823 (or 2998798 counting only the distinct ones).

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

Adding to 21231001320000 its reverse (2310013212), we get a palindrome (21233311333212).

The spelling of 21231001320000 in words is "twenty-one trillion, two hundred thirty-one billion, one million, three hundred twenty thousand".