1212111211011 has 16 divisors (see below), whose sum is σ = 1621585225728. Its totient is φ = 805356440000.

The previous prime is 1212111210991. The next prime is 1212111211021. The reversal of 1212111211011 is 1101121112121.

It is a cyclic number.

It is not a de Polignac number, because 1212111211011 - 2³⁵ = 1177751472643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212111211021) 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 15 ways as a sum of consecutive naturals, for example, 6439150 + ... + 6624716.

It is an arithmetic number, because the mean of its divisors is an integer number (101349076608).

Almost surely, 2^{1212111211011} is an apocalyptic number.

1212111211011 is a deficient number, since it is larger than the sum of its proper divisors (409474014717).

1212111211011 is a wasteful number, since it uses less digits than its factorization.

1212111211011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192882.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1212111211011 its reverse (1101121112121), we get a palindrome (2313232323132).

It can be divided in two parts, 12121112110 and 11, that added together give a palindrome (12121112121).

The spelling of 1212111211011 in words is "one trillion, two hundred twelve billion, one hundred eleven million, two hundred eleven thousand, eleven".