12122121122 has 4 divisors (see below), whose sum is σ = 18183181686. Its totient is φ = 6061060560.

The previous prime is 12122121103. The next prime is 12122121149. The reversal of 12122121122 is 22112122121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22112122121 = 22273 ⋅992777.

It can be written as a sum of positive squares in only one way, i.e., 11573671561 + 548449561 = 107581^2 + 23419^2 .

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 12122121122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3030530279 + ... + 3030530282.

Almost surely, 2^12122121122 is an apocalyptic number.

12122121122 is a deficient number, since it is larger than the sum of its proper divisors (6061060564).

12122121122 is an equidigital number, since it uses as much as digits as its factorization.

12122121122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6061060563.

The product of its digits is 64, while the sum is 17.

Adding to 12122121122 its reverse (22112122121), we get a palindrome (34234243243).

Subtracting 12122121122 from its reverse (22112122121), we obtain a palindrome (9990000999).

The spelling of 12122121122 in words is "twelve billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty-two".