133331213 has 4 divisors (see below), whose sum is σ = 133361280. Its totient is φ = 133301148.

The previous prime is 133331201. The next prime is 133331251. The reversal of 133331213 is 312133331.

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.

It is a cyclic number.

It is not a de Polignac number, because 133331213 - 2¹⁰ = 133330189 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 (133336213) 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, 6923 + ... + 17736.

It is an arithmetic number, because the mean of its divisors is an integer number (33340320).

Almost surely, 2^133331213 is an apocalyptic number.

It is an amenable number.

133331213 is a deficient number, since it is larger than the sum of its proper divisors (30067).

133331213 is an equidigital number, since it uses as much as digits as its factorization.

133331213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30066.

The product of its digits is 486, while the sum is 20.

The square root of 133331213 is about 11546.9135703009. The cubic root of 133331213 is about 510.8702468623.

Adding to 133331213 its reverse (312133331), we get a palindrome (445464544).

The spelling of 133331213 in words is "one hundred thirty-three million, three hundred thirty-one thousand, two hundred thirteen".