1211111031105 has 64 divisors (see below), whose sum is σ = 2169142387200. Its totient is φ = 641116166400.

The previous prime is 1211111031071. The next prime is 1211111031107. The reversal of 1211111031105 is 5011301111121.

It is not a de Polignac number, because 1211111031105 - 2⁶ = 1211111031041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211111031107) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25192231 + ... + 25240259.

It is an arithmetic number, because the mean of its divisors is an integer number (33892849800).

Almost surely, 2^{1211111031105} is an apocalyptic number.

1211111031105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211111031105 is a deficient number, since it is larger than the sum of its proper divisors (958031356095).

1211111031105 is a wasteful number, since it uses less digits than its factorization.

1211111031105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49431 (or 49425 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 18.

Adding to 1211111031105 its reverse (5011301111121), we get a palindrome (6222412142226).

The spelling of 1211111031105 in words is "one trillion, two hundred eleven billion, one hundred eleven million, thirty-one thousand, one hundred five".