33031220221 has 4 divisors (see below), whose sum is σ = 33091606912. Its totient is φ = 32970833532.

The previous prime is 33031220203. The next prime is 33031220227. The reversal of 33031220221 is 12202213033.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12202213033 = 61001 ⋅200033.

It is a cyclic number.

It is not a de Polignac number, because 33031220221 - 2⁹ = 33031219709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33031220227) 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, 30192525 + ... + 30193618.

It is an arithmetic number, because the mean of its divisors is an integer number (8272901728).

Almost surely, 2^33031220221 is an apocalyptic number.

It is an amenable number.

33031220221 is a deficient number, since it is larger than the sum of its proper divisors (60386691).

33031220221 is an equidigital number, since it uses as much as digits as its factorization.

33031220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60386690.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 33031220221 its reverse (12202213033), we get a palindrome (45233433254).

The spelling of 33031220221 in words is "thirty-three billion, thirty-one million, two hundred twenty thousand, two hundred twenty-one".