321345220 has 48 divisors (see below), whose sum is σ = 816600960. Its totient is φ = 103693824.

The previous prime is 321345217. The next prime is 321345223. The reversal of 321345220 is 22543123.

It is an interprime number because it is at equal distance from previous prime (321345217) and next prime (321345223).

It is a junction number, because it is equal to n+sod(n) for n = 321345191 and 321345200.

It is not an unprimeable number, because it can be changed into a prime (321345223) 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, 65130 + ... + 69889.

It is an arithmetic number, because the mean of its divisors is an integer number (17012520).

Almost surely, 2^321345220 is an apocalyptic number.

It is an amenable number.

321345220 is an abundant number, since it is smaller than the sum of its proper divisors (495255740).

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

321345220 is a wasteful number, since it uses less digits than its factorization.

321345220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135052 (or 135050 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 321345220 is about 17926.1044290164. The cubic root of 321345220 is about 684.9474945104.

Adding to 321345220 its reverse (22543123), we get a palindrome (343888343).

The spelling of 321345220 in words is "three hundred twenty-one million, three hundred forty-five thousand, two hundred twenty".