1211234111 has 2 divisors, whose sum is σ = 1211234112. Its totient is φ = 1211234110.

The previous prime is 1211234093. The next prime is 1211234113. The reversal of 1211234111 is 1114321121.

It is a strong prime.

It is an emirp because it is prime and its reverse (1114321121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211234111 - 2⁶ = 1211234047 is a prime.

Together with 1211234113, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211234111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211234113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605617055 + 605617056.

It is an arithmetic number, because the mean of its divisors is an integer number (605617056).

Almost surely, 2^1211234111 is an apocalyptic number.

1211234111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211234111 is an equidigital number, since it uses as much as digits as its factorization.

1211234111 is an evil number, because the sum of its binary digits is even.

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

The square root of 1211234111 is about 34802.7888394019. The cubic root of 1211234111 is about 1065.9643923047.

Adding to 1211234111 its reverse (1114321121), we get a palindrome (2325555232).

The spelling of 1211234111 in words is "one billion, two hundred eleven million, two hundred thirty-four thousand, one hundred eleven".