21304005515000 has 320 divisors, whose sum is σ = 57469875503040. Its totient is φ = 7331466240000.

The previous prime is 21304005514937. The next prime is 21304005515047. The reversal of 21304005515000 is 51550040312.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 113721410 + ... + 113908590.

It is an arithmetic number, because the mean of its divisors is an integer number (179593360947).

Almost surely, 2^{21304005515000} is an apocalyptic number.

21304005515000 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 21304005515000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28734937751520).

21304005515000 is an abundant number, since it is smaller than the sum of its proper divisors (36165869988040).

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

21304005515000 is a wasteful number, since it uses less digits than its factorization.

21304005515000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187340 (or 187321 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 21304005515000 its reverse (51550040312), we get a palindrome (21355555555312).

The spelling of 21304005515000 in words is "twenty-one trillion, three hundred four billion, five million, five hundred fifteen thousand".