1211122112211 has 24 divisors (see below), whose sum is σ = 1909671918336. Its totient is φ = 733537603440.

The previous prime is 1211122112203. The next prime is 1211122112323. The reversal of 1211122112211 is 1122112211121.

It is a happy number.

1211122112211 is a `hidden beast` number, since 121 + 112 + 211 + 221 + 1 = 666.

It is not a de Polignac number, because 1211122112211 - 2³ = 1211122112203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211122112911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3811455 + ... + 4116968.

It is an arithmetic number, because the mean of its divisors is an integer number (79569663264).

Almost surely, 2^{1211122112211} is an apocalyptic number.

1211122112211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211122112211 is a deficient number, since it is larger than the sum of its proper divisors (698549806125).

1211122112211 is a wasteful number, since it uses less digits than its factorization.

1211122112211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7929983 (or 7929980 counting only the distinct ones).

The product of its digits is 32, while the sum is 18.

Adding to 1211122112211 its reverse (1122112211121), we get a palindrome (2333234323332).

It can be divided in two parts, 121 and 1122112211, that multiplied together give a palindrome (135775577531).

The spelling of 1211122112211 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, one hundred twelve thousand, two hundred eleven".