21310123320 has 96 divisors (see below), whose sum is σ = 69943741920. Its totient is φ = 5626425600.

The previous prime is 21310123301. The next prime is 21310123399. The reversal of 21310123320 is 2332101312.

21310123320 is a `hidden beast` number, since 21 + 310 + 1 + 2 + 332 + 0 = 666.

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 = 21310123293 and 21310123302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 256684 + ... + 329403.

It is an arithmetic number, because the mean of its divisors is an integer number (728580645).

Almost surely, 2^21310123320 is an apocalyptic number.

21310123320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21310123320 is an abundant number, since it is smaller than the sum of its proper divisors (48633618600).

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

21310123320 is a wasteful number, since it uses less digits than its factorization.

21310123320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586205 (or 586198 counting only the distinct ones).

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

Adding to 21310123320 its reverse (2332101312), we get a palindrome (23642224632).

The spelling of 21310123320 in words is "twenty-one billion, three hundred ten million, one hundred twenty-three thousand, three hundred twenty".