1211122122211 has 4 divisors (see below), whose sum is σ = 1211360678032. Its totient is φ = 1210883566392.

The previous prime is 1211122122169. The next prime is 1211122122239. The reversal of 1211122122211 is 1122212211121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1211122122211 - 2¹¹ = 1211122120163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211122122911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119270295 + ... + 119280448.

It is an arithmetic number, because the mean of its divisors is an integer number (302840169508).

Almost surely, 2^{1211122122211} is an apocalyptic number.

1211122122211 is a deficient number, since it is larger than the sum of its proper divisors (238555821).

1211122122211 is an equidigital number, since it uses as much as digits as its factorization.

1211122122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238555820.

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

Adding to 1211122122211 its reverse (1122212211121), we get a palindrome (2333334333332).

The spelling of 1211122122211 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred eleven".