21031302321000 has 256 divisors, whose sum is σ = 73076935276800. Its totient is φ = 5595391872000.

The previous prime is 21031302320983. The next prime is 21031302321023. The reversal of 21031302321000 is 12320313012.

21031302321000 is a `hidden beast` number, since 2 + 10 + 31 + 302 + 321 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10791535 + ... + 12590465.

It is an arithmetic number, because the mean of its divisors is an integer number (285456778425).

Almost surely, 2^{21031302321000} is an apocalyptic number.

21031302321000 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 21031302321000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36538467638400).

21031302321000 is an abundant number, since it is smaller than the sum of its proper divisors (52045632955800).

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

21031302321000 is a wasteful number, since it uses less digits than its factorization.

21031302321000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799394 (or 1799374 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21031302321000 its reverse (12320313012), we get a palindrome (21043622634012).

The spelling of 21031302321000 in words is "twenty-one trillion, thirty-one billion, three hundred two million, three hundred twenty-one thousand".