33411221 has 4 divisors (see below), whose sum is σ = 33428844. Its totient is φ = 33393600.

The previous prime is 33411199. The next prime is 33411229. The reversal of 33411221 is 12211433.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13608721 + 19802500 = 3689^2 + 4450^2 .

It is a cyclic number.

It is not a de Polignac number, because 33411221 - 2¹⁰ = 33410197 is a prime.

It is a super-2 number, since 2×33411221² = 2232619377421682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33411221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33411229) 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, 5570 + ... + 9891.

It is an arithmetic number, because the mean of its divisors is an integer number (8357211).

Almost surely, 2^33411221 is an apocalyptic number.

It is an amenable number.

33411221 is a deficient number, since it is larger than the sum of its proper divisors (17623).

33411221 is a wasteful number, since it uses less digits than its factorization.

33411221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17622.

The product of its digits is 144, while the sum is 17.

The square root of 33411221 is about 5780.2440259906. The cubic root of 33411221 is about 322.0802656018.

Adding to 33411221 its reverse (12211433), we get a palindrome (45622654).

The spelling of 33411221 in words is "thirty-three million, four hundred eleven thousand, two hundred twenty-one".