21031320112000 has 256 divisors, whose sum is σ = 58256372828160. Its totient is φ = 7485031680000.

The previous prime is 21031320111947. The next prime is 21031320112007. The reversal of 21031320112000 is 21102313012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031320112007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7000765 + ... + 9543235.

It is an arithmetic number, because the mean of its divisors is an integer number (227563956360).

Almost surely, 2^{21031320112000} is an apocalyptic number.

21031320112000 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 21031320112000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29128186414080).

21031320112000 is an abundant number, since it is smaller than the sum of its proper divisors (37225052716160).

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

21031320112000 is a wasteful number, since it uses less digits than its factorization.

21031320112000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2542558 (or 2542536 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21031320112000 its reverse (21102313012), we get a palindrome (21052422425012).

The spelling of 21031320112000 in words is "twenty-one trillion, thirty-one billion, three hundred twenty million, one hundred twelve thousand".