133221311 has 4 divisors (see below), whose sum is σ = 133255512. Its totient is φ = 133187112.

The previous prime is 133221307. The next prime is 133221317. The reversal of 133221311 is 113122331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 133221311 - 2² = 133221307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133221311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133221317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10376 + ... + 19341.

It is an arithmetic number, because the mean of its divisors is an integer number (33313878).

Almost surely, 2^133221311 is an apocalyptic number.

133221311 is a deficient number, since it is larger than the sum of its proper divisors (34201).

133221311 is an equidigital number, since it uses as much as digits as its factorization.

133221311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34200.

The product of its digits is 108, while the sum is 17.

The square root of 133221311 is about 11542.1536551893. The cubic root of 133221311 is about 510.7298418908.

Adding to 133221311 its reverse (113122331), we get a palindrome (246343642).

The spelling of 133221311 in words is "one hundred thirty-three million, two hundred twenty-one thousand, three hundred eleven".