33445213 has 4 divisors (see below), whose sum is σ = 33457788. Its totient is φ = 33432640.

The previous prime is 33445211. The next prime is 33445219. The reversal of 33445213 is 31254433.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 29615364 + 3829849 = 5442^2 + 1957^2 .

It is a cyclic number.

It is not a de Polignac number, because 33445213 - 2¹ = 33445211 is a prime.

It is a super-2 number, since 2×33445213² = 2237164545230738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33445211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 556 + ... + 8197.

It is an arithmetic number, because the mean of its divisors is an integer number (8364447).

Almost surely, 2^33445213 is an apocalyptic number.

It is an amenable number.

33445213 is a deficient number, since it is larger than the sum of its proper divisors (12575).

33445213 is an equidigital number, since it uses as much as digits as its factorization.

33445213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12574.

The product of its digits is 4320, while the sum is 25.

The square root of 33445213 is about 5783.1836387927. The cubic root of 33445213 is about 322.1894548835.

Adding to 33445213 its reverse (31254433), we get a palindrome (64699646).

The spelling of 33445213 in words is "thirty-three million, four hundred forty-five thousand, two hundred thirteen".