33121332221 has 4 divisors (see below), whose sum is σ = 33340678944. Its totient is φ = 32901985500.

The previous prime is 33121332121. The next prime is 33121332269. The reversal of 33121332221 is 12223312133.

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: 12223312133 = 349 ⋅35023817.

It is a cyclic number.

It is not a de Polignac number, because 33121332221 - 2¹⁰ = 33121331197 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 (33121332121) 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, 109673135 + ... + 109673436.

It is an arithmetic number, because the mean of its divisors is an integer number (8335169736).

Almost surely, 2^33121332221 is an apocalyptic number.

It is an amenable number.

33121332221 is a deficient number, since it is larger than the sum of its proper divisors (219346723).

33121332221 is a wasteful number, since it uses less digits than its factorization.

33121332221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219346722.

The product of its digits is 1296, while the sum is 23.

Adding to 33121332221 its reverse (12223312133), we get a palindrome (45344644354).

The spelling of 33121332221 in words is "thirty-three billion, one hundred twenty-one million, three hundred thirty-two thousand, two hundred twenty-one".