133212213 has 6 divisors (see below), whose sum is σ = 192417654. Its totient is φ = 88808136.

The previous prime is 133212203. The next prime is 133212229. The reversal of 133212213 is 312212331.

It can be written as a sum of positive squares in only one way, i.e., 104407524 + 28804689 = 10218^2 + 5367^2 .

It is not a de Polignac number, because 133212213 - 2⁵ = 133212181 is a prime.

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 (133212203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7400670 + ... + 7400687.

It is an arithmetic number, because the mean of its divisors is an integer number (32069609).

Almost surely, 2^133212213 is an apocalyptic number.

It is an amenable number.

133212213 is a deficient number, since it is larger than the sum of its proper divisors (59205441).

133212213 is a wasteful number, since it uses less digits than its factorization.

133212213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14801363 (or 14801360 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 133212213 is about 11541.7595279056. The cubic root of 133212213 is about 510.7182153078.

Adding to 133212213 its reverse (312212331), we get a palindrome (445424544).

The spelling of 133212213 in words is "one hundred thirty-three million, two hundred twelve thousand, two hundred thirteen".