1111211111111 has 8 divisors (see below), whose sum is σ = 1140045604560. Its totient is φ = 1082709964672.

The previous prime is 1111211111089. The next prime is 1111211111149. The reversal of 1111211111111 is 1111111121111.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111211111111 is a prime.

It is a Duffinian number.

1111211111111 is a modest number, since divided by 1111111 gives 111121 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111211111161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83330000 + ... + 83343333.

It is an arithmetic number, because the mean of its divisors is an integer number (142505700570).

Almost surely, 2^{1111211111111} is an apocalyptic number.

1111211111111 is a deficient number, since it is larger than the sum of its proper divisors (28834493449).

1111211111111 is a wasteful number, since it uses less digits than its factorization.

1111211111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166673505.

The product of its digits is 2, while the sum is 14.

Adding to 1111211111111 its reverse (1111111121111), we get a palindrome (2222322232222).

It can be divided in two parts, 111121111 and 1111, that multiplied together give a palindrome (123455554321).

The spelling of 1111211111111 in words is "one trillion, one hundred eleven billion, two hundred eleven million, one hundred eleven thousand, one hundred eleven".