1211235211 has 2 divisors, whose sum is σ = 1211235212. Its totient is φ = 1211235210.

The previous prime is 1211235209. The next prime is 1211235229. The reversal of 1211235211 is 1125321121.

It is a weak prime.

It is an emirp because it is prime and its reverse (1125321121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211235211 - 2¹ = 1211235209 is a prime.

Together with 1211235209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1211235271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605617605 + 605617606.

It is an arithmetic number, because the mean of its divisors is an integer number (605617606).

Almost surely, 2^1211235211 is an apocalyptic number.

1211235211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211235211 is an equidigital number, since it uses as much as digits as its factorization.

1211235211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 19.

The square root of 1211235211 is about 34802.8046427296. The cubic root of 1211235211 is about 1065.9647149950.

Adding to 1211235211 its reverse (1125321121), we get a palindrome (2336556332).

The spelling of 1211235211 in words is "one billion, two hundred eleven million, two hundred thirty-five thousand, two hundred eleven".