21321322320 has 40 divisors (see below), whose sum is σ = 66096099936. Its totient is φ = 5685685888.

The previous prime is 21321322289. The next prime is 21321322349. The reversal of 21321322320 is 2322312312.

It is a happy number.

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

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 7 ways as a sum of consecutive naturals, for example, 44419182 + ... + 44419661.

Almost surely, 2^21321322320 is an apocalyptic number.

21321322320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21321322320 is an abundant number, since it is smaller than the sum of its proper divisors (44774777616).

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

21321322320 is a wasteful number, since it uses less digits than its factorization.

21321322320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88838859 (or 88838853 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21321322320 its reverse (2322312312), we get a palindrome (23643634632).

The spelling of 21321322320 in words is "twenty-one billion, three hundred twenty-one million, three hundred twenty-two thousand, three hundred twenty".