33002121221 has 4 divisors (see below), whose sum is σ = 33002501100. Its totient is φ = 33001741344.

The previous prime is 33002121203. The next prime is 33002121227. The reversal of 33002121221 is 12212120033.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 26032209025 + 6969912196 = 161345^2 + 83486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33002121221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33002121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33002121227) 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, 11795 + ... + 257183.

It is an arithmetic number, because the mean of its divisors is an integer number (8250625275).

Almost surely, 2^33002121221 is an apocalyptic number.

It is an amenable number.

33002121221 is a deficient number, since it is larger than the sum of its proper divisors (379879).

33002121221 is a wasteful number, since it uses less digits than its factorization.

33002121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379878.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 33002121221 its reverse (12212120033), we get a palindrome (45214241254).

The spelling of 33002121221 in words is "thirty-three billion, two million, one hundred twenty-one thousand, two hundred twenty-one".