12001002221 has 16 divisors (see below), whose sum is σ = 13003374384. Its totient is φ = 11010069504.

The previous prime is 12001002199. The next prime is 12001002229. The reversal of 12001002221 is 12220010021.

It is a happy number.

12001002221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 144841225 + 11856160996 = 12035^2 + 108886^2 .

It is a cyclic number.

It is not a de Polignac number, because 12001002221 - 2¹⁴ = 12000985837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001002229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3319811 + ... + 3323423.

It is an arithmetic number, because the mean of its divisors is an integer number (812710899).

Almost surely, 2^12001002221 is an apocalyptic number.

It is an amenable number.

12001002221 is a deficient number, since it is larger than the sum of its proper divisors (1002372163).

12001002221 is a wasteful number, since it uses less digits than its factorization.

12001002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5120.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12001002221 its reverse (12220010021), we get a palindrome (24221012242).

The spelling of 12001002221 in words is "twelve billion, one million, two thousand, two hundred twenty-one".