1211100101011 has 4 divisors (see below), whose sum is σ = 1216531043392. Its totient is φ = 1205669158632.

The previous prime is 1211100100993. The next prime is 1211100101027. The reversal of 1211100101011 is 1101010011121.

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 1211100101011 - 2⁵ = 1211100100979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211100101111) 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, 2715470856 + ... + 2715471301.

It is an arithmetic number, because the mean of its divisors is an integer number (304132760848).

Almost surely, 2^{1211100101011} is an apocalyptic number.

1211100101011 is a deficient number, since it is larger than the sum of its proper divisors (5430942381).

1211100101011 is an equidigital number, since it uses as much as digits as its factorization.

1211100101011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5430942380.

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 1211100101011 its reverse (1101010011121), we get a palindrome (2312110112132).

The spelling of 1211100101011 in words is "one trillion, two hundred eleven billion, one hundred million, one hundred one thousand, eleven".