4033121221 has 4 divisors (see below), whose sum is σ = 4033465132. Its totient is φ = 4032777312.

The previous prime is 4033121219. The next prime is 4033121227. The reversal of 4033121221 is 1221213304.

It is a happy number.

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 202749121 + 3830372100 = 14239^2 + 61890^2 .

It is a cyclic number.

It is not a de Polignac number, because 4033121221 - 2¹ = 4033121219 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 (4033121227) 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, 153720 + ... + 178033.

It is an arithmetic number, because the mean of its divisors is an integer number (1008366283).

Almost surely, 2^4033121221 is an apocalyptic number.

It is an amenable number.

4033121221 is a deficient number, since it is larger than the sum of its proper divisors (343911).

4033121221 is a wasteful number, since it uses less digits than its factorization.

4033121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343910.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 4033121221 is about 63506.8596373652. The cubic root of 4033121221 is about 1591.7704026368.

Adding to 4033121221 its reverse (1221213304), we get a palindrome (5254334525).

The spelling of 4033121221 in words is "four billion, thirty-three million, one hundred twenty-one thousand, two hundred twenty-one".