320021323221 has 12 divisors (see below), whose sum is σ = 440903471136. Its totient is φ = 206465367960.

The previous prime is 320021323217. The next prime is 320021323231. The reversal of 320021323221 is 122323120023.

It is a happy number.

It is not a de Polignac number, because 320021323221 - 2² = 320021323217 is a prime.

It is a super-2 number, since 2×320021323221² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320021323201) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 55498561 + ... + 55504326.

It is an arithmetic number, because the mean of its divisors is an integer number (36741955928).

Almost surely, 2^320021323221 is an apocalyptic number.

320021323221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

320021323221 is a deficient number, since it is larger than the sum of its proper divisors (120882147915).

320021323221 is a wasteful number, since it uses less digits than its factorization.

320021323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111002952 (or 111002921 counting only the distinct ones).

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

Adding to 320021323221 its reverse (122323120023), we get a palindrome (442344443244).

The spelling of 320021323221 in words is "three hundred twenty billion, twenty-one million, three hundred twenty-three thousand, two hundred twenty-one".