33242221 has 2 divisors, whose sum is σ = 33242222. Its totient is φ = 33242220.

The previous prime is 33242219. The next prime is 33242233. The reversal of 33242221 is 12224233.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24890121 + 8352100 = 4989^2 + 2890^2 .

It is a cyclic number.

It is not a de Polignac number, because 33242221 - 2¹ = 33242219 is a prime.

It is a super-2 number, since 2×33242221² = 2210090514025682, which contains 22 as substring.

Together with 33242219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33242821) 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 as a sum of consecutive naturals, namely, 16621110 + 16621111.

It is an arithmetic number, because the mean of its divisors is an integer number (16621111).

Almost surely, 2^33242221 is an apocalyptic number.

It is an amenable number.

33242221 is a deficient number, since it is larger than the sum of its proper divisors (1).

33242221 is an equidigital number, since it uses as much as digits as its factorization.

33242221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 19.

The square root of 33242221 is about 5765.6067330334. The cubic root of 33242221 is about 321.5363006610.

Adding to 33242221 its reverse (12224233), we get a palindrome (45466454).

The spelling of 33242221 in words is "thirty-three million, two hundred forty-two thousand, two hundred twenty-one".