1211211111011 has 8 divisors (see below), whose sum is σ = 1322332185024. Its totient is φ = 1100258532520.

The previous prime is 1211211111007. The next prime is 1211211111017. The reversal of 1211211111011 is 1101111121121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211211111011 - 2² = 1211211111007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211211111017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42108845 + ... + 42137598.

It is an arithmetic number, because the mean of its divisors is an integer number (165291523128).

Almost surely, 2^{1211211111011} is an apocalyptic number.

1211211111011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211211111011 is a deficient number, since it is larger than the sum of its proper divisors (111121074013).

1211211111011 is a wasteful number, since it uses less digits than its factorization.

1211211111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84247761.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 1211211111011 its reverse (1101111121121), we get a palindrome (2312322232132).

The spelling of 1211211111011 in words is "one trillion, two hundred eleven billion, two hundred eleven million, one hundred eleven thousand, eleven".