33231213 has 6 divisors (see below), whose sum is σ = 48000654. Its totient is φ = 22154136.

The previous prime is 33231179. The next prime is 33231221. The reversal of 33231213 is 31213233.

It can be written as a sum of positive squares in only one way, i.e., 33212169 + 19044 = 5763^2 + 138^2 .

It is not a de Polignac number, because 33231213 - 2⁸ = 33230957 is a prime.

It is a super-2 number, since 2×33231213² = 2208627034902738, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33231223) 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, 1846170 + ... + 1846187.

It is an arithmetic number, because the mean of its divisors is an integer number (8000109).

Almost surely, 2^33231213 is an apocalyptic number.

It is an amenable number.

33231213 is a deficient number, since it is larger than the sum of its proper divisors (14769441).

33231213 is a wasteful number, since it uses less digits than its factorization.

33231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3692363 (or 3692360 counting only the distinct ones).

The product of its digits is 324, while the sum is 18.

The square root of 33231213 is about 5764.6520276596. The cubic root of 33231213 is about 321.5008050146.

Adding to 33231213 its reverse (31213233), we get a palindrome (64444446).

It can be divided in two parts, 33231 and 213, that multiplied together give a triangular number (7078203 = T₃₇₆₂).

The spelling of 33231213 in words is "thirty-three million, two hundred thirty-one thousand, two hundred thirteen".