21304054500 has 96 divisors (see below), whose sum is σ = 62070363264. Its totient is φ = 5678064000.

The previous prime is 21304054477. The next prime is 21304054517. The reversal of 21304054500 is 545040312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5417535 + ... + 5421465.

It is an arithmetic number, because the mean of its divisors is an integer number (646566284).

Almost surely, 2^21304054500 is an apocalyptic number.

21304054500 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 21304054500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31035181632).

21304054500 is an abundant number, since it is smaller than the sum of its proper divisors (40766308764).

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

21304054500 is a wasteful number, since it uses less digits than its factorization.

21304054500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7566 (or 7554 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

Adding to 21304054500 its reverse (545040312), we get a palindrome (21849094812).

The spelling of 21304054500 in words is "twenty-one billion, three hundred four million, fifty-four thousand, five hundred".