1211111101011 has 32 divisors (see below), whose sum is σ = 1930591756800. Its totient is φ = 660691342080.

The previous prime is 1211111100989. The next prime is 1211111101021. The reversal of 1211111101011 is 1101011111121.

It is not a de Polignac number, because 1211111101011 - 2⁷ = 1211111100883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211111101021) 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 31 ways as a sum of consecutive naturals, for example, 11118205 + ... + 11226606.

It is an arithmetic number, because the mean of its divisors is an integer number (60330992400).

Almost surely, 2^{1211111101011} is an apocalyptic number.

1211111101011 is a deficient number, since it is larger than the sum of its proper divisors (719480655789).

1211111101011 is a wasteful number, since it uses less digits than its factorization.

1211111101011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22344939.

The product of its (nonzero) digits is 2, while the sum is 12.

Adding to 1211111101011 its reverse (1101011111121), we get a palindrome (2312122212132).

It can be divided in two parts, 1211111 and 101011, that multiplied together give a palindrome (122335533221).

The spelling of 1211111101011 in words is "one trillion, two hundred eleven billion, one hundred eleven million, one hundred one thousand, eleven".