12002211121 has 4 divisors (see below), whose sum is σ = 12416080500. Its totient is φ = 11588341744.

The previous prime is 12002211059. The next prime is 12002211163. The reversal of 12002211121 is 12111220021.

12002211121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12111220021 = 34939 ⋅346639.

It can be written as a sum of positive squares in 2 ways, for example, as 4317935521 + 7684275600 = 65711^2 + 87660^2 .

It is a cyclic number.

It is not a de Polignac number, because 12002211121 - 2¹⁷ = 12002080049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12002311121) 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 3 ways as a sum of consecutive naturals, for example, 206934646 + ... + 206934703.

It is an arithmetic number, because the mean of its divisors is an integer number (3104020125).

Almost surely, 2^12002211121 is an apocalyptic number.

It is an amenable number.

12002211121 is a deficient number, since it is larger than the sum of its proper divisors (413869379).

12002211121 is an equidigital number, since it uses as much as digits as its factorization.

12002211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413869378.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12002211121 its reverse (12111220021), we get a palindrome (24113431142).

The spelling of 12002211121 in words is "twelve billion, two million, two hundred eleven thousand, one hundred twenty-one".