321222120 has 64 divisors (see below), whose sum is σ = 978073920. Its totient is φ = 84378624.

The previous prime is 321222107. The next prime is 321222127. The reversal of 321222120 is 21222123.

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 321222120.

It is not an unprimeable number, because it can be changed into a prime (321222127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11937 + ... + 28016.

It is an arithmetic number, because the mean of its divisors is an integer number (15282405).

Almost surely, 2^321222120 is an apocalyptic number.

321222120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

321222120 is an abundant number, since it is smaller than the sum of its proper divisors (656851800).

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

321222120 is a wasteful number, since it uses less digits than its factorization.

321222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40034 (or 40030 counting only the distinct ones).

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

The square root of 321222120 is about 17922.6705599361. The cubic root of 321222120 is about 684.8600207695.

Adding to 321222120 its reverse (21222123), we get a palindrome (342444243).

The spelling of 321222120 in words is "three hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty".