321423220 has 12 divisors (see below), whose sum is σ = 674988804. Its totient is φ = 128569280.

The previous prime is 321423191. The next prime is 321423251. The reversal of 321423220 is 22324123.

It can be written as a sum of positive squares in 2 ways, for example, as 34527376 + 286895844 = 5876^2 + 16938^2 .

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 3 ways as a sum of consecutive naturals, for example, 8035561 + ... + 8035600.

It is an arithmetic number, because the mean of its divisors is an integer number (56249067).

Almost surely, 2^321423220 is an apocalyptic number.

It is an amenable number.

321423220 is an abundant number, since it is smaller than the sum of its proper divisors (353565584).

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

321423220 is a wasteful number, since it uses less digits than its factorization.

321423220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16071170 (or 16071168 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 321423220 is about 17928.2798951824. The cubic root of 321423220 is about 685.0029090398.

Adding to 321423220 its reverse (22324123), we get a palindrome (343747343).

The spelling of 321423220 in words is "three hundred twenty-one million, four hundred twenty-three thousand, two hundred twenty".