21303310320 has 60 divisors (see below), whose sum is σ = 71543619576. Its totient is φ = 5680882560.

The previous prime is 21303310319. The next prime is 21303310331. The reversal of 21303310320 is 2301330312.

21303310320 is a `hidden beast` number, since 2 + 1 + 30 + 3 + 310 + 320 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

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

It is a junction number, because it is equal to n+sod(n) for n = 21303310293 and 21303310302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14793246 + ... + 14794685.

Almost surely, 2^21303310320 is an apocalyptic number.

21303310320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21303310320 is an abundant number, since it is smaller than the sum of its proper divisors (50240309256).

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

21303310320 is a wasteful number, since it uses less digits than its factorization.

21303310320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29587950 (or 29587941 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21303310320 its reverse (2301330312), we get a palindrome (23604640632).

The spelling of 21303310320 in words is "twenty-one billion, three hundred three million, three hundred ten thousand, three hundred twenty".