33143221 has 4 divisors (see below), whose sum is σ = 33266700. Its totient is φ = 33019744.

The previous prime is 33143213. The next prime is 33143233. The reversal of 33143221 is 12234133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12234133 = 67 ⋅182599.

It can be written as a sum of positive squares in 2 ways, for example, as 9084196 + 24059025 = 3014^2 + 4905^2 .

It is a cyclic number.

It is not a de Polignac number, because 33143221 - 2³ = 33143213 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 (33143261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61336 + ... + 61873.

It is an arithmetic number, because the mean of its divisors is an integer number (8316675).

Almost surely, 2^33143221 is an apocalyptic number.

It is an amenable number.

33143221 is a deficient number, since it is larger than the sum of its proper divisors (123479).

33143221 is a wasteful number, since it uses less digits than its factorization.

33143221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123478.

The product of its digits is 432, while the sum is 19.

The square root of 33143221 is about 5757.0149383166. The cubic root of 33143221 is about 321.2167898568.

Adding to 33143221 its reverse (12234133), we get a palindrome (45377354).

The spelling of 33143221 in words is "thirty-three million, one hundred forty-three thousand, two hundred twenty-one".