133423321 has 4 divisors (see below), whose sum is σ = 133731892. Its totient is φ = 133114752.

The previous prime is 133423289. The next prime is 133423333. The reversal of 133423321 is 123324331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123324331 = 13 ⋅9486487.

It can be written as a sum of positive squares in 2 ways, for example, as 4260096 + 129163225 = 2064^2 + 11365^2 .

It is a cyclic number.

It is not a de Polignac number, because 133423321 - 2⁵ = 133423289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133423292 and 133423301.

It is not an unprimeable number, because it can be changed into a prime (133427321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153636 + ... + 154501.

It is an arithmetic number, because the mean of its divisors is an integer number (33432973).

Almost surely, 2^133423321 is an apocalyptic number.

It is an amenable number.

133423321 is a deficient number, since it is larger than the sum of its proper divisors (308571).

133423321 is an equidigital number, since it uses as much as digits as its factorization.

133423321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308570.

The product of its digits is 1296, while the sum is 22.

The square root of 133423321 is about 11550.9013068245. The cubic root of 133423321 is about 510.9878597458.

Adding to 133423321 its reverse (123324331), we get a palindrome (256747652).

The spelling of 133423321 in words is "one hundred thirty-three million, four hundred twenty-three thousand, three hundred twenty-one".