321220120 has 32 divisors (see below), whose sum is σ = 778342320. Its totient is φ = 118604160.

The previous prime is 321220103. The next prime is 321220147. The reversal of 321220120 is 21022123.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 321220120.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 308346 + ... + 309385.

Almost surely, 2^321220120 is an apocalyptic number.

It is an amenable number.

321220120 is an abundant number, since it is smaller than the sum of its proper divisors (457122200).

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

321220120 is a wasteful number, since it uses less digits than its factorization.

321220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617755 (or 617751 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 321220120 is about 17922.6147645928. The cubic root of 321220120 is about 684.8585994032.

Adding to 321220120 its reverse (21022123), we get a palindrome (342242243).

It can be divided in two parts, 3212 and 20120, that added together give a palindrome (23332).

The spelling of 321220120 in words is "three hundred twenty-one million, two hundred twenty thousand, one hundred twenty".