320123121 has 16 divisors (see below), whose sum is σ = 442169280. Its totient is φ = 205863680.

The previous prime is 320123113. The next prime is 320123129. The reversal of 320123121 is 121321023.

It is an interprime number because it is at equal distance from previous prime (320123113) and next prime (320123129).

It is a cyclic number.

It is not a de Polignac number, because 320123121 - 2³ = 320123113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320123121.

It is not an unprimeable number, because it can be changed into a prime (320123129) 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, 3675 + ... + 25568.

It is an arithmetic number, because the mean of its divisors is an integer number (27635580).

Almost surely, 2^320123121 is an apocalyptic number.

It is an amenable number.

320123121 is a deficient number, since it is larger than the sum of its proper divisors (122046159).

320123121 is a wasteful number, since it uses less digits than its factorization.

320123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29376.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 320123121 is about 17891.9848256140. The cubic root of 320123121 is about 684.0780899011.

Adding to 320123121 its reverse (121321023), we get a palindrome (441444144).

The spelling of 320123121 in words is "three hundred twenty million, one hundred twenty-three thousand, one hundred twenty-one".