33120020221 has 4 divisors (see below), whose sum is σ = 34863179200. Its totient is φ = 31376861244.

The previous prime is 33120020209. The next prime is 33120020231. The reversal of 33120020221 is 12202002133.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33120020221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33120020195 and 33120020204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33120020231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 871579461 + ... + 871579498.

It is an arithmetic number, because the mean of its divisors is an integer number (8715794800).

Almost surely, 2^33120020221 is an apocalyptic number.

It is an amenable number.

33120020221 is a deficient number, since it is larger than the sum of its proper divisors (1743158979).

33120020221 is a wasteful number, since it uses less digits than its factorization.

33120020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1743158978.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 33120020221 its reverse (12202002133), we get a palindrome (45322022354).

The spelling of 33120020221 in words is "thirty-three billion, one hundred twenty million, twenty thousand, two hundred twenty-one".