321220 has 12 divisors (see below), whose sum is σ = 674604. Its totient is φ = 128480.

The previous prime is 321203. The next prime is 321221. The reversal of 321220 is 22123.

It can be written as a sum of positive squares in 2 ways, for example, as 42436 + 278784 = 206^2 + 528^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 321197 and 321206.

It is not an unprimeable number, because it can be changed into a prime (321221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8011 + ... + 8050.

It is an arithmetic number, because the mean of its divisors is an integer number (56217).

2³²¹²²⁰ is an apocalyptic number.

It is an amenable number.

321220 is an abundant number, since it is smaller than the sum of its proper divisors (353384).

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

321220 is a wasteful number, since it uses less digits than its factorization.

321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16070 (or 16068 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 321220 is about 566.7627369544. The cubic root of 321220 is about 68.4858514121.

Adding to 321220 its reverse (22123), we get a palindrome (343343).

The spelling of 321220 in words is "three hundred twenty-one thousand, two hundred twenty", and thus it is an iban number.