12210202121 has 4 divisors (see below), whose sum is σ = 13149448452. Its totient is φ = 11270955792.

The previous prime is 12210202091. The next prime is 12210202129. The reversal of 12210202121 is 12120201221.

12210202121 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.

It can be written as a sum of positive squares in 2 ways, for example, as 2992090000 + 9218112121 = 54700^2 + 96011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12210202121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12210202096 and 12210202105.

It is not an unprimeable number, because it can be changed into a prime (12210202129) 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, 469623146 + ... + 469623171.

It is an arithmetic number, because the mean of its divisors is an integer number (3287362113).

Almost surely, 2^12210202121 is an apocalyptic number.

It is an amenable number.

12210202121 is a deficient number, since it is larger than the sum of its proper divisors (939246331).

12210202121 is an equidigital number, since it uses as much as digits as its factorization.

12210202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939246330.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12210202121 its reverse (12120201221), we get a palindrome (24330403342).

The spelling of 12210202121 in words is "twelve billion, two hundred ten million, two hundred two thousand, one hundred twenty-one".