21320032321 has 8 divisors (see below), whose sum is σ = 25425131904. Its totient is φ = 17479777920.

The previous prime is 21320032319. The next prime is 21320032339. The reversal of 21320032321 is 12323002312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21320032321 - 2¹ = 21320032319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21320032361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66211120 + ... + 66211441.

It is an arithmetic number, because the mean of its divisors is an integer number (3178141488).

Almost surely, 2^21320032321 is an apocalyptic number.

It is an amenable number.

21320032321 is a deficient number, since it is larger than the sum of its proper divisors (4105099583).

21320032321 is a wasteful number, since it uses less digits than its factorization.

21320032321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132422591.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21320032321 its reverse (12323002312), we get a palindrome (33643034633).

The spelling of 21320032321 in words is "twenty-one billion, three hundred twenty million, thirty-two thousand, three hundred twenty-one".