133331321 has 2 divisors, whose sum is σ = 133331322. Its totient is φ = 133331320.

The previous prime is 133331291. The next prime is 133331333. The reversal of 133331321 is 123133331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92371321 + 40960000 = 9611^2 + 6400^2 .

It is an emirp because it is prime and its reverse (123133331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133331321 - 2⁶ = 133331257 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 133331293 and 133331302.

It is not a weakly prime, because it can be changed into another prime (133331351) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66665660 + 66665661.

It is an arithmetic number, because the mean of its divisors is an integer number (66665661).

Almost surely, 2^133331321 is an apocalyptic number.

It is an amenable number.

133331321 is a deficient number, since it is larger than the sum of its proper divisors (1).

133331321 is an equidigital number, since it uses as much as digits as its factorization.

133331321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486, while the sum is 20.

The square root of 133331321 is about 11546.9182468744. The cubic root of 133331321 is about 510.8703847994.

Adding to 133331321 its reverse (123133331), we get a palindrome (256464652).

The spelling of 133331321 in words is "one hundred thirty-three million, three hundred thirty-one thousand, three hundred twenty-one".