320121133220 has 96 divisors (see below), whose sum is σ = 802574438400. Its totient is φ = 104868618624.

The previous prime is 320121133207. The next prime is 320121133229. The reversal of 320121133220 is 22331121023.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 320121133192 and 320121133201.

It is not an unprimeable number, because it can be changed into a prime (320121133229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2905091 + ... + 3013269.

It is an arithmetic number, because the mean of its divisors is an integer number (8360150400).

Almost surely, 2^320121133220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320121133220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (401287219200).

320121133220 is an abundant number, since it is smaller than the sum of its proper divisors (482453305180).

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

320121133220 is a wasteful number, since it uses less digits than its factorization.

320121133220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109137 (or 109135 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 320121133220 its reverse (22331121023), we get a palindrome (342452254243).

The spelling of 320121133220 in words is "three hundred twenty billion, one hundred twenty-one million, one hundred thirty-three thousand, two hundred twenty".