133313221 has 8 divisors (see below), whose sum is σ = 141070464. Its totient is φ = 125719440.

The previous prime is 133313161. The next prime is 133313231. The reversal of 133313221 is 122313331.

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 133313221 - 2¹⁵ = 133280453 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133313231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39186 + ... + 42451.

It is an arithmetic number, because the mean of its divisors is an integer number (17633808).

Almost surely, 2^133313221 is an apocalyptic number.

It is an amenable number.

133313221 is a deficient number, since it is larger than the sum of its proper divisors (7757243).

133313221 is an equidigital number, since it uses as much as digits as its factorization.

133313221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81731.

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

The square root of 133313221 is about 11546.1344613684. The cubic root of 133313221 is about 510.8472665195.

Adding to 133313221 its reverse (122313331), we get a palindrome (255626552).

The spelling of 133313221 in words is "one hundred thirty-three million, three hundred thirteen thousand, two hundred twenty-one".