12102211021 has 4 divisors (see below), whose sum is σ = 12172166172. Its totient is φ = 12032255872.

The previous prime is 12102210973. The next prime is 12102211027. The reversal of 12102211021 is 12011220121.

12102211021 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: 12011220121 = 163 ⋅73688467.

It can be written as a sum of positive squares in 2 ways, for example, as 9581668996 + 2520542025 = 97886^2 + 50205^2 .

It is a cyclic number.

It is not a de Polignac number, because 12102211021 - 2¹⁹ = 12101686733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12102210992 and 12102211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12102211027) 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, 34977316 + ... + 34977661.

It is an arithmetic number, because the mean of its divisors is an integer number (3043041543).

Almost surely, 2^12102211021 is an apocalyptic number.

It is an amenable number.

12102211021 is a deficient number, since it is larger than the sum of its proper divisors (69955151).

12102211021 is an equidigital number, since it uses as much as digits as its factorization.

12102211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69955150.

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

Adding to 12102211021 its reverse (12011220121), we get a palindrome (24113431142).

The spelling of 12102211021 in words is "twelve billion, one hundred two million, two hundred eleven thousand, twenty-one".