33020012121221 has 4 divisors (see below), whose sum is σ = 33912444881292. Its totient is φ = 32127579361152.

The previous prime is 33020012121209. The next prime is 33020012121223. The reversal of 33020012121221 is 12212121002033.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20302864456900 + 12717147664321 = 4505870^2 + 3566111^2 .

It is a cyclic number.

It is not a de Polignac number, because 33020012121221 - 2³⁰ = 33018938379397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33020012121193 and 33020012121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33020012121223) 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, 446216379980 + ... + 446216380053.

It is an arithmetic number, because the mean of its divisors is an integer number (8478111220323).

Almost surely, 2^{33020012121221} is an apocalyptic number.

It is an amenable number.

33020012121221 is a deficient number, since it is larger than the sum of its proper divisors (892432760071).

33020012121221 is an equidigital number, since it uses as much as digits as its factorization.

33020012121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892432760070.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 33020012121221 its reverse (12212121002033), we get a palindrome (45232133123254).

The spelling of 33020012121221 in words is "thirty-three trillion, twenty billion, twelve million, one hundred twenty-one thousand, two hundred twenty-one".