21211304320 has 32 divisors (see below), whose sum is σ = 50708275920. Its totient is φ = 8484521472.

The previous prime is 21211304297. The next prime is 21211304327. The reversal of 21211304320 is 2340311212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211304327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16570692 + ... + 16571971.

Almost surely, 2^21211304320 is an apocalyptic number.

21211304320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211304320 is an abundant number, since it is smaller than the sum of its proper divisors (29496971600).

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

21211304320 is an equidigital number, since it uses as much as digits as its factorization.

21211304320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33142682 (or 33142670 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21211304320 its reverse (2340311212), we get a palindrome (23551615532).

The spelling of 21211304320 in words is "twenty-one billion, two hundred eleven million, three hundred four thousand, three hundred twenty".