21344304320 has 28 divisors (see below), whose sum is σ = 50826125424. Its totient is φ = 8537721600.

The previous prime is 21344304307. The next prime is 21344304329. The reversal of 21344304320 is 2340344312.

It is a self number, because there is not a number n which added to its sum of digits gives 21344304320.

It is not an unprimeable number, because it can be changed into a prime (21344304329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33350156 + ... + 33350795.

Almost surely, 2^21344304320 is an apocalyptic number.

21344304320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21344304320 is an abundant number, since it is smaller than the sum of its proper divisors (29481821104).

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

21344304320 is an equidigital number, since it uses as much as digits as its factorization.

21344304320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66700968 (or 66700958 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 21344304320 its reverse (2340344312), we get a palindrome (23684648632).

The spelling of 21344304320 in words is "twenty-one billion, three hundred forty-four million, three hundred four thousand, three hundred twenty".