321323120220 has 96 divisors (see below), whose sum is σ = 915204407040. Its totient is φ = 84210803200.

The previous prime is 321323120201. The next prime is 321323120257. The reversal of 321323120220 is 22021323123.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 15746344 + ... + 15766736.

It is an arithmetic number, because the mean of its divisors is an integer number (9533379240).

Almost surely, 2^321323120220 is an apocalyptic number.

321323120220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321323120220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (457602203520).

321323120220 is an abundant number, since it is smaller than the sum of its proper divisors (593881286820).

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

321323120220 is a wasteful number, since it uses less digits than its factorization.

321323120220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24915 (or 24913 counting only the distinct ones).

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

Adding to 321323120220 its reverse (22021323123), we get a palindrome (343344443343).

The spelling of 321323120220 in words is "three hundred twenty-one billion, three hundred twenty-three million, one hundred twenty thousand, two hundred twenty".