33131230221 has 12 divisors (see below), whose sum is σ = 46622342112. Its totient is φ = 20924986824.

The previous prime is 33131230211. The next prime is 33131230241. The reversal of 33131230221 is 12203213133.

It is not a de Polignac number, because 33131230221 - 2⁹ = 33131229709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33131230211) 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 11 ways as a sum of consecutive naturals, for example, 15294961 + ... + 15297126.

It is an arithmetic number, because the mean of its divisors is an integer number (3885195176).

Almost surely, 2^33131230221 is an apocalyptic number.

It is an amenable number.

33131230221 is a deficient number, since it is larger than the sum of its proper divisors (13491111891).

33131230221 is a wasteful number, since it uses less digits than its factorization.

33131230221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30592128 (or 30592109 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 33131230221 its reverse (12203213133), we get a palindrome (45334443354).

The spelling of 33131230221 in words is "thirty-three billion, one hundred thirty-one million, two hundred thirty thousand, two hundred twenty-one".