33212161 has 4 divisors (see below), whose sum is σ = 34656192. Its totient is φ = 31768132.

The previous prime is 33212147. The next prime is 33212189. The reversal of 33212161 is 16121233.

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: 16121233 = 37 ⋅435709.

It is a cyclic number.

It is not a de Polignac number, because 33212161 - 2⁹ = 33211649 is a prime.

It is a super-2 number, since 2×33212161² = 2206095276579842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33212111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721981 + ... + 722026.

It is an arithmetic number, because the mean of its divisors is an integer number (8664048).

Almost surely, 2^33212161 is an apocalyptic number.

It is an amenable number.

33212161 is a deficient number, since it is larger than the sum of its proper divisors (1444031).

33212161 is a wasteful number, since it uses less digits than its factorization.

33212161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444030.

The product of its digits is 216, while the sum is 19.

The square root of 33212161 is about 5762.9993059170. Note that the first 3 decimals coincide. The cubic root of 33212161 is about 321.4393527060.

Adding to 33212161 its reverse (16121233), we get a palindrome (49333394).

The spelling of 33212161 in words is "thirty-three million, two hundred twelve thousand, one hundred sixty-one".