1211212121122 has 4 divisors (see below), whose sum is σ = 1816818181686. Its totient is φ = 605606060560.

The previous prime is 1211212121039. The next prime is 1211212121131. The reversal of 1211212121122 is 2211212121121.

It is a happy number.

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., 689163965281 + 522048155841 = 830159^2 + 722529^2 .

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 1211212121122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302803030279 + ... + 302803030282.

Almost surely, 2^{1211212121122} is an apocalyptic number.

1211212121122 is a deficient number, since it is larger than the sum of its proper divisors (605606060564).

1211212121122 is an equidigital number, since it uses as much as digits as its factorization.

1211212121122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605606060563.

The product of its digits is 64, while the sum is 19.

Adding to 1211212121122 its reverse (2211212121121), we get a palindrome (3422424242243).

Subtracting 1211212121122 from its reverse (2211212121121), we obtain a palindrome (999999999999).

The spelling of 1211212121122 in words is "one trillion, two hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, one hundred twenty-two".