133221331 has 8 divisors (see below), whose sum is σ = 145069200. Its totient is φ = 121857120.

The previous prime is 133221317. The next prime is 133221343. The reversal of 133221331 is 133122331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133221331 - 2¹⁹ = 132697043 is a prime.

It is a super-2 number, since 2×133221331² = 35495846066823122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133221299 and 133221308.

It is not an unprimeable number, because it can be changed into a prime (133221301) 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 7 ways as a sum of consecutive naturals, for example, 120340 + ... + 121441.

It is an arithmetic number, because the mean of its divisors is an integer number (18133650).

Almost surely, 2^133221331 is an apocalyptic number.

133221331 is a deficient number, since it is larger than the sum of its proper divisors (11847869).

133221331 is a wasteful number, since it uses less digits than its factorization.

133221331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241829.

The product of its digits is 324, while the sum is 19.

The square root of 133221331 is about 11542.1545215787. The cubic root of 133221331 is about 510.7298674488.

Adding to 133221331 its reverse (133122331), we get a palindrome (266343662).

The spelling of 133221331 in words is "one hundred thirty-three million, two hundred twenty-one thousand, three hundred thirty-one".