1211111342 has 12 divisors (see below), whose sum is σ = 2113265880. Its totient is φ = 519047676.

The previous prime is 1211111339. The next prime is 1211111351. The reversal of 1211111342 is 2431111121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211111342.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6179042 + ... + 6179237.

It is an arithmetic number, because the mean of its divisors is an integer number (176105490).

Almost surely, 2^1211111342 is an apocalyptic number.

1211111342 is a deficient number, since it is larger than the sum of its proper divisors (902154538).

1211111342 is a wasteful number, since it uses less digits than its factorization.

1211111342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12358295 (or 12358288 counting only the distinct ones).

The product of its digits is 48, while the sum is 17.

The square root of 1211111342 is about 34801.0250136400. The cubic root of 1211111342 is about 1065.9283761998.

Adding to 1211111342 its reverse (2431111121), we get a palindrome (3642222463).

The spelling of 1211111342 in words is "one billion, two hundred eleven million, one hundred eleven thousand, three hundred forty-two".