33332221 has 16 divisors (see below), whose sum is σ = 38384640. Its totient is φ = 28702080.

The previous prime is 33332197. The next prime is 33332231. The reversal of 33332221 is 12223333.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33332221 is a prime.

It is a super-2 number, since 2×33332221² = 2222073913585682, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33332231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10900 + ... + 13618.

It is an arithmetic number, because the mean of its divisors is an integer number (2399040).

Almost surely, 2^33332221 is an apocalyptic number.

It is an amenable number.

33332221 is a deficient number, since it is larger than the sum of its proper divisors (5052419).

33332221 is a wasteful number, since it uses less digits than its factorization.

33332221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2796.

The product of its digits is 648, while the sum is 19.

The square root of 33332221 is about 5773.4063602002. The cubic root of 33332221 is about 321.8262150086.

Adding to 33332221 its reverse (12223333), we get a palindrome (45555554).

The spelling of 33332221 in words is "thirty-three million, three hundred thirty-two thousand, two hundred twenty-one".