133204321 has 2 divisors, whose sum is σ = 133204322. Its totient is φ = 133204320.

The previous prime is 133204319. The next prime is 133204343. The reversal of 133204321 is 123402331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83923921 + 49280400 = 9161^2 + 7020^2 .

It is a cyclic number.

It is not a de Polignac number, because 133204321 - 2¹ = 133204319 is a prime.

It is a super-2 number, since 2×133204321² = 35486782266142082, which contains 22 as substring.

Together with 133204319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (133208321) 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 as a sum of consecutive naturals, namely, 66602160 + 66602161.

It is an arithmetic number, because the mean of its divisors is an integer number (66602161).

Almost surely, 2^133204321 is an apocalyptic number.

It is an amenable number.

133204321 is a deficient number, since it is larger than the sum of its proper divisors (1).

133204321 is an equidigital number, since it uses as much as digits as its factorization.

133204321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 133204321 is about 11541.4176338958. The cubic root of 133204321 is about 510.7081294764.

Adding to 133204321 its reverse (123402331), we get a palindrome (256606652).

The spelling of 133204321 in words is "one hundred thirty-three million, two hundred four thousand, three hundred twenty-one".