423120321 has 16 divisors (see below), whose sum is σ = 675064320. Its totient is φ = 260381520.

The previous prime is 423120317. The next prime is 423120331. The reversal of 423120321 is 123021324.

It is not a de Polignac number, because 423120321 - 2² = 423120317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 423120294 and 423120303.

It is not an unprimeable number, because it can be changed into a prime (423120331) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 602385 + ... + 603086.

It is an arithmetic number, because the mean of its divisors is an integer number (42191520).

Almost surely, 2^423120321 is an apocalyptic number.

It is an amenable number.

423120321 is a deficient number, since it is larger than the sum of its proper divisors (251943999).

423120321 is a wasteful number, since it uses less digits than its factorization.

423120321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205493 (or 1205487 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 423120321 is about 20569.8886968306. Note that the first 3 decimals coincide. The cubic root of 423120321 is about 750.7372430594.

Adding to 423120321 its reverse (123021324), we get a palindrome (546141645).

The spelling of 423120321 in words is "four hundred twenty-three million, one hundred twenty thousand, three hundred twenty-one".