33442131221 has 4 divisors (see below), whose sum is σ = 33528101100. Its totient is φ = 33356161344.

The previous prime is 33442131193. The next prime is 33442131227. The reversal of 33442131221 is 12213124433.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12213124433 = 12689 ⋅962497.

It can be written as a sum of positive squares in 2 ways, for example, as 8283730225 + 25158400996 = 91015^2 + 158614^2 .

It is a cyclic number.

It is not a de Polignac number, because 33442131221 - 2⁶ = 33442131157 is a prime.

It is a super-2 number, since 2×33442131221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33442131227) 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 3 ways as a sum of consecutive naturals, for example, 42984356 + ... + 42985133.

It is an arithmetic number, because the mean of its divisors is an integer number (8382025275).

Almost surely, 2^33442131221 is an apocalyptic number.

It is an amenable number.

33442131221 is a deficient number, since it is larger than the sum of its proper divisors (85969879).

33442131221 is an equidigital number, since it uses as much as digits as its factorization.

33442131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85969878.

The product of its digits is 3456, while the sum is 26.

Adding to 33442131221 its reverse (12213124433), we get a palindrome (45655255654).

The spelling of 33442131221 in words is "thirty-three billion, four hundred forty-two million, one hundred thirty-one thousand, two hundred twenty-one".