33333213 has 16 divisors (see below), whose sum is σ = 45714240. Its totient is φ = 21592704.

The previous prime is 33333203. The next prime is 33333217. The reversal of 33333213 is 31233333.

It is not a de Polignac number, because 33333213 - 2²¹ = 31236061 is a prime.

It is a super-2 number, since 2×33333213² = 2222206177806738, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 33333213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33333217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29503 + ... + 30611.

It is an arithmetic number, because the mean of its divisors is an integer number (2857140).

Almost surely, 2^33333213 is an apocalyptic number.

It is an amenable number.

33333213 is a deficient number, since it is larger than the sum of its proper divisors (12381027).

33333213 is a wasteful number, since it uses less digits than its factorization.

33333213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388.

The product of its digits is 1458, while the sum is 21.

The square root of 33333213 is about 5773.4922707145. The cubic root of 33333213 is about 321.8294075996.

Adding to 33333213 its reverse (31233333), we get a palindrome (64566546).

The spelling of 33333213 in words is "thirty-three million, three hundred thirty-three thousand, two hundred thirteen".