133020321 has 16 divisors (see below), whose sum is σ = 206022528. Its totient is φ = 74764800.

The previous prime is 133020317. The next prime is 133020331. The reversal of 133020321 is 123020331.

It is not a de Polignac number, because 133020321 - 2² = 133020317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133020321.

It is not an unprimeable number, because it can be changed into a prime (133020331) 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 15 ways as a sum of consecutive naturals, for example, 50640 + ... + 53201.

It is an arithmetic number, because the mean of its divisors is an integer number (12876408).

Almost surely, 2^133020321 is an apocalyptic number.

It is an amenable number.

133020321 is a deficient number, since it is larger than the sum of its proper divisors (73002207).

133020321 is a wasteful number, since it uses less digits than its factorization.

133020321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103912.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 133020321 is about 11533.4435881050. The cubic root of 133020321 is about 510.4728678459.

Adding to 133020321 its reverse (123020331), we get a palindrome (256040652).

The spelling of 133020321 in words is "one hundred thirty-three million, twenty thousand, three hundred twenty-one".