12222202121 has 4 divisors (see below), whose sum is σ = 12224597652. Its totient is φ = 12219806592.

The previous prime is 12222202087. The next prime is 12222202129. The reversal of 12222202121 is 12120222221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12120222221 = 27581 ⋅439441.

It can be written as a sum of positive squares in 2 ways, for example, as 3037663225 + 9184538896 = 55115^2 + 95836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12222202121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12222202121.

It is not an unprimeable number, because it can be changed into a prime (12222202129) 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, 1190096 + ... + 1200321.

It is an arithmetic number, because the mean of its divisors is an integer number (3056149413).

Almost surely, 2^12222202121 is an apocalyptic number.

It is an amenable number.

12222202121 is a deficient number, since it is larger than the sum of its proper divisors (2395531).

12222202121 is an equidigital number, since it uses as much as digits as its factorization.

12222202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2395530.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12222202121 its reverse (12120222221), we get a palindrome (24342424342).

The spelling of 12222202121 in words is "twelve billion, two hundred twenty-two million, two hundred two thousand, one hundred twenty-one".