1131211211111 has 4 divisors (see below), whose sum is σ = 1131215975400. Its totient is φ = 1131206446824.

The previous prime is 1131211211107. The next prime is 1131211211177. The reversal of 1131211211111 is 1111121121311.

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 1131211211111 - 2² = 1131211211107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1131211211111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131211210111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2006216 + ... + 2507453.

It is an arithmetic number, because the mean of its divisors is an integer number (282803993850).

Almost surely, 2^{1131211211111} is an apocalyptic number.

1131211211111 is a deficient number, since it is larger than the sum of its proper divisors (4764289).

1131211211111 is an equidigital number, since it uses as much as digits as its factorization.

1131211211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4764288.

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

Adding to 1131211211111 its reverse (1111121121311), we get a palindrome (2242332332422).

The spelling of 1131211211111 in words is "one trillion, one hundred thirty-one billion, two hundred eleven million, two hundred eleven thousand, one hundred eleven".