33120321221 has 16 divisors (see below), whose sum is σ = 35870361408. Its totient is φ = 30399600000.

The previous prime is 33120321209. The next prime is 33120321239. The reversal of 33120321221 is 12212302133.

It is a cyclic number.

It is not a de Polignac number, because 33120321221 - 2¹⁰ = 33120320197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33120321193 and 33120321202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33120321721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2005046 + ... + 2021496.

It is an arithmetic number, because the mean of its divisors is an integer number (2241897588).

Almost surely, 2^33120321221 is an apocalyptic number.

It is an amenable number.

33120321221 is a deficient number, since it is larger than the sum of its proper divisors (2750040187).

33120321221 is a wasteful number, since it uses less digits than its factorization.

33120321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17332.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 33120321221 its reverse (12212302133), we get a palindrome (45332623354).

The spelling of 33120321221 in words is "thirty-three billion, one hundred twenty million, three hundred twenty-one thousand, two hundred twenty-one".