2320121220 has 96 divisors (see below), whose sum is σ = 6937297920. Its totient is φ = 578081280.

The previous prime is 2320121183. The next prime is 2320121227. The reversal of 2320121220 is 221210232.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2320121220.

It is not an unprimeable number, because it can be changed into a prime (2320121227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32434 + ... + 75446.

It is an arithmetic number, because the mean of its divisors is an integer number (72263520).

Almost surely, 2^2320121220 is an apocalyptic number.

2320121220 is a gapful number since it is divisible by the number (20) 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 2320121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3468648960).

2320121220 is an abundant number, since it is smaller than the sum of its proper divisors (4617176700).

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

2320121220 is a wasteful number, since it uses less digits than its factorization.

2320121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43085 (or 43083 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 2320121220 is about 48167.6366453659. The cubic root of 2320121220 is about 1323.8442457561.

Adding to 2320121220 its reverse (221210232), we get a palindrome (2541331452).

The spelling of 2320121220 in words is "two billion, three hundred twenty million, one hundred twenty-one thousand, two hundred twenty".