33031213 has 4 divisors (see below), whose sum is σ = 34096768. Its totient is φ = 31965660.

The previous prime is 33031211. The next prime is 33031217. The reversal of 33031213 is 31213033.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31213033 = 163 ⋅191491.

It is a cyclic number.

It is not a de Polignac number, because 33031213 - 2¹ = 33031211 is a prime.

It is a super-2 number, since 2×33031213² = 2182122064502738, 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 (33031211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532731 + ... + 532792.

It is an arithmetic number, because the mean of its divisors is an integer number (8524192).

Almost surely, 2^33031213 is an apocalyptic number.

It is an amenable number.

33031213 is a deficient number, since it is larger than the sum of its proper divisors (1065555).

33031213 is a wasteful number, since it uses less digits than its factorization.

33031213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065554.

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

The square root of 33031213 is about 5747.2787473725. The cubic root of 33031213 is about 320.8545291819.

Adding to 33031213 its reverse (31213033), we get a palindrome (64244246).

The spelling of 33031213 in words is "thirty-three million, thirty-one thousand, two hundred thirteen".