1131212111111 has 16 divisors (see below), whose sum is σ = 1163855740320. Its totient is φ = 1099073310720.

The previous prime is 1131212111101. The next prime is 1131212111171. The reversal of 1131212111111 is 1111112121311.

It is a cyclic number.

It is not a de Polignac number, because 1131212111111 - 2²² = 1131207916807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1131212111111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131212111101) 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 15 ways as a sum of consecutive naturals, for example, 2113121 + ... + 2593781.

It is an arithmetic number, because the mean of its divisors is an integer number (72740983770).

Almost surely, 2^{1131212111111} is an apocalyptic number.

1131212111111 is a deficient number, since it is larger than the sum of its proper divisors (32643629209).

1131212111111 is a wasteful number, since it uses less digits than its factorization.

1131212111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481186.

The product of its digits is 12, while the sum is 17.

Adding to 1131212111111 its reverse (1111112121311), we get a palindrome (2242324232422).

The spelling of 1131212111111 in words is "one trillion, one hundred thirty-one billion, two hundred twelve million, one hundred eleven thousand, one hundred eleven".