133221333 has 32 divisors (see below), whose sum is σ = 217092096. Its totient is φ = 70933248.

The previous prime is 133221317. The next prime is 133221343. The reversal of 133221333 is 333122331.

It is not a de Polignac number, because 133221333 - 2⁴ = 133221317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133221343) 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 31 ways as a sum of consecutive naturals, for example, 34960 + ... + 38582.

It is an arithmetic number, because the mean of its divisors is an integer number (6784128).

Almost surely, 2^133221333 is an apocalyptic number.

It is an amenable number.

133221333 is a deficient number, since it is larger than the sum of its proper divisors (83870763).

133221333 is a wasteful number, since it uses less digits than its factorization.

133221333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753.

The product of its digits is 972, while the sum is 21.

The square root of 133221333 is about 11542.1546082177. The cubic root of 133221333 is about 510.7298700045.

Adding to 133221333 its reverse (333122331), we get a palindrome (466343664).

The spelling of 133221333 in words is "one hundred thirty-three million, two hundred twenty-one thousand, three hundred thirty-three".