33121033221 has 4 divisors (see below), whose sum is σ = 44161377632. Its totient is φ = 22080688812.

The previous prime is 33121033213. The next prime is 33121033223. The reversal of 33121033221 is 12233012133.

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.

It is not a de Polignac number, because 33121033221 - 2³ = 33121033213 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 (33121033223) 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, 5520172201 + ... + 5520172206.

It is an arithmetic number, because the mean of its divisors is an integer number (11040344408).

Almost surely, 2^33121033221 is an apocalyptic number.

It is an amenable number.

33121033221 is a deficient number, since it is larger than the sum of its proper divisors (11040344411).

33121033221 is a wasteful number, since it uses less digits than its factorization.

33121033221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11040344410.

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

Adding to 33121033221 its reverse (12233012133), we get a palindrome (45354045354).

The spelling of 33121033221 in words is "thirty-three billion, one hundred twenty-one million, thirty-three thousand, two hundred twenty-one".