133306221 has 8 divisors (see below), whose sum is σ = 177890944. Its totient is φ = 88796160.

The previous prime is 133306219. The next prime is 133306267. The reversal of 133306221 is 122603331.

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

It is not a de Polignac number, because 133306221 - 2¹ = 133306219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133301221) 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, 14356 + ... + 21741.

It is an arithmetic number, because the mean of its divisors is an integer number (22236368).

Almost surely, 2^133306221 is an apocalyptic number.

It is an amenable number.

133306221 is a deficient number, since it is larger than the sum of its proper divisors (44584723).

133306221 is a wasteful number, since it uses less digits than its factorization.

133306221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37331.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 133306221 is about 11545.8313256344. The cubic root of 133306221 is about 510.8383251871.

Adding to 133306221 its reverse (122603331), we get a palindrome (255909552).

The spelling of 133306221 in words is "one hundred thirty-three million, three hundred six thousand, two hundred twenty-one".