123130321 has 4 divisors (see below), whose sum is σ = 123166132. Its totient is φ = 123094512.

The previous prime is 123130243. The next prime is 123130327. The reversal of 123130321 is 123031321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113742225 + 9388096 = 10665^2 + 3064^2 .

It is a cyclic number.

It is not a de Polignac number, because 123130321 - 2⁷ = 123130193 is a prime.

It is a super-2 number, since 2×123130321² = 30322151899126082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123130295 and 123130304.

It is not an unprimeable number, because it can be changed into a prime (123130327) 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, 12126 + ... + 19831.

It is an arithmetic number, because the mean of its divisors is an integer number (30791533).

Almost surely, 2^123130321 is an apocalyptic number.

It is an amenable number.

123130321 is a deficient number, since it is larger than the sum of its proper divisors (35811).

123130321 is an equidigital number, since it uses as much as digits as its factorization.

123130321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35810.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 123130321 is about 11096.4102753999. The cubic root of 123130321 is about 497.4945611890.

Adding to 123130321 its reverse (123031321), we get a palindrome (246161642).

The spelling of 123130321 in words is "one hundred twenty-three million, one hundred thirty thousand, three hundred twenty-one".