12122222122 has 4 divisors (see below), whose sum is σ = 18183333186. Its totient is φ = 6061111060.

The previous prime is 12122222117. The next prime is 12122222153. The reversal of 12122222122 is 22122222121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7846239241 + 4275982881 = 88579^2 + 65391^2 .

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 12122222122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3030555529 + ... + 3030555532.

Almost surely, 2^12122222122 is an apocalyptic number.

12122222122 is a deficient number, since it is larger than the sum of its proper divisors (6061111064).

12122222122 is an equidigital number, since it uses as much as digits as its factorization.

12122222122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6061111063.

The product of its digits is 256, while the sum is 19.

Adding to 12122222122 its reverse (22122222121), we get a palindrome (34244444243).

Subtracting 12122222122 from its reverse (22122222121), we obtain a palindrome (9999999999).

The spelling of 12122222122 in words is "twelve billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-two".