133321213 has 4 divisors (see below), whose sum is σ = 133459488. Its totient is φ = 133182940.

The previous prime is 133321211. The next prime is 133321229. The reversal of 133321213 is 312123331.

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: 312123331 = 13 ⋅24009487.

It is a cyclic number.

It is not a de Polignac number, because 133321213 - 2¹ = 133321211 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 (133321211) 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, 67681 + ... + 69622.

It is an arithmetic number, because the mean of its divisors is an integer number (33364872).

Almost surely, 2^133321213 is an apocalyptic number.

It is an amenable number.

133321213 is a deficient number, since it is larger than the sum of its proper divisors (138275).

133321213 is an equidigital number, since it uses as much as digits as its factorization.

133321213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138274.

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

The square root of 133321213 is about 11546.4805460365. The cubic root of 133321213 is about 510.8574745837.

Adding to 133321213 its reverse (312123331), we get a palindrome (445444544).

The spelling of 133321213 in words is "one hundred thirty-three million, three hundred twenty-one thousand, two hundred thirteen".