33013213 has 4 divisors (see below), whose sum is σ = 33905500. Its totient is φ = 32120928.

The previous prime is 33013199. The next prime is 33013217. The reversal of 33013213 is 31231033.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31231033 = 23 ⋅1357871.

It can be written as a sum of positive squares in 2 ways, for example, as 30769209 + 2244004 = 5547^2 + 1498^2 .

It is a cyclic number.

It is not a de Polignac number, because 33013213 - 2⁵ = 33013181 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 (33013217) 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, 446088 + ... + 446161.

It is an arithmetic number, because the mean of its divisors is an integer number (8476375).

Almost surely, 2^33013213 is an apocalyptic number.

It is an amenable number.

33013213 is a deficient number, since it is larger than the sum of its proper divisors (892287).

33013213 is an equidigital number, since it uses as much as digits as its factorization.

33013213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892286.

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 33013213 is about 5745.7125754775. The cubic root of 33013213 is about 320.7962365309.

Adding to 33013213 its reverse (31231033), we get a palindrome (64244246).

The spelling of 33013213 in words is "thirty-three million, thirteen thousand, two hundred thirteen".