21104234320 has 40 divisors (see below), whose sum is σ = 52841758536. Its totient is φ = 7792332288.

The previous prime is 21104234279. The next prime is 21104234443. The reversal of 21104234320 is 2343240112.

It can be written as a sum of positive squares in 4 ways, for example, as 650658064 + 20453576256 = 25508^2 + 143016^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 21104234291 and 21104234300.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 10145227 + ... + 10147306.

Almost surely, 2^21104234320 is an apocalyptic number.

21104234320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21104234320 is an abundant number, since it is smaller than the sum of its proper divisors (31737524216).

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

21104234320 is a wasteful number, since it uses less digits than its factorization.

21104234320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20292559 (or 20292553 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21104234320 its reverse (2343240112), we get a palindrome (23447474432).

The spelling of 21104234320 in words is "twenty-one billion, one hundred four million, two hundred thirty-four thousand, three hundred twenty".