133321 has 2 divisors, whose sum is σ = 133322.
Its totient is φ = 133320.
The previous prime is 133319. The next prime is 133327. The reversal of 133321 is 123331.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 129600 + 3721 = 360^2 + 61^2
It is a cyclic number.
It is not a de Polignac number, because 133321 - 21 = 133319 is a prime.
Together with 133319, it forms a pair of twin primes.
It is not a weakly prime, because it can be changed into another prime (133327) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66660 + 66661.
It is an arithmetic number, because the mean of its divisors is an integer number (66661).
2133321 is an apocalyptic number.
It is an amenable number.
133321 is a deficient number, since it is larger than the sum of its proper divisors (1).
133321 is an equidigital number, since it uses as much as digits as its factorization.
133321 is an evil number, because the sum of its binary digits is even.
The product of its digits is 54, while the sum is 13.
The square root of 133321 is about 365.1314831674.
The cubic root of 133321 is about 51.0857202527.
Adding to 133321 its reverse (123331), we get a palindrome (256652).
It can be divided in two parts, 133 and 321, that added together give a palindrome (454).
The spelling of 133321 in words is "one hundred thirty-three thousand, three hundred twenty-one".