33158213 has 4 divisors (see below), whose sum is σ = 36172608. Its totient is φ = 30143820.

The previous prime is 33158183. The next prime is 33158219. The reversal of 33158213 is 31285133.

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: 31285133 = 11 ⋅2844103.

It is a cyclic number.

It is not a de Polignac number, because 33158213 - 2¹⁸ = 32896069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33158219) 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, 1507181 + ... + 1507202.

It is an arithmetic number, because the mean of its divisors is an integer number (9043152).

Almost surely, 2^33158213 is an apocalyptic number.

It is an amenable number.

33158213 is a deficient number, since it is larger than the sum of its proper divisors (3014395).

33158213 is a wasteful number, since it uses less digits than its factorization.

33158213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014394.

The product of its digits is 2160, while the sum is 26.

The square root of 33158213 is about 5758.3168547762. The cubic root of 33158213 is about 321.2652156086.

Subtracting from 33158213 its reverse (31285133), we obtain a triangular number (1873080 = T₁₉₃₅).

The spelling of 33158213 in words is "thirty-three million, one hundred fifty-eight thousand, two hundred thirteen".