133821317 has 4 divisors (see below), whose sum is σ = 152938656. Its totient is φ = 114703980.

The previous prime is 133821301. The next prime is 133821323. The reversal of 133821317 is 713128331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 713128331 = 71 ⋅10044061.

It is a cyclic number.

It is not a de Polignac number, because 133821317 - 2⁴ = 133821301 is a prime.

It is a super-2 number, since 2×133821317² = 35816289767228978, which contains 22 as substring.

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 133821317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133821367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9558659 + ... + 9558672.

It is an arithmetic number, because the mean of its divisors is an integer number (38234664).

Almost surely, 2^133821317 is an apocalyptic number.

It is an amenable number.

133821317 is a deficient number, since it is larger than the sum of its proper divisors (19117339).

133821317 is an equidigital number, since it uses as much as digits as its factorization.

133821317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19117338.

The product of its digits is 3024, while the sum is 29.

The square root of 133821317 is about 11568.1163981004. The cubic root of 133821317 is about 511.4954402832.

Adding to 133821317 its reverse (713128331), we get a palindrome (846949648).

The spelling of 133821317 in words is "one hundred thirty-three million, eight hundred twenty-one thousand, three hundred seventeen".