1211130211 has 4 divisors (see below), whose sum is σ = 1212883624. Its totient is φ = 1209376800.

The previous prime is 1211130209. The next prime is 1211130241. The reversal of 1211130211 is 1120311121.

It is a happy number.

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 1211130211 - 2¹ = 1211130209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211130191 and 1211130200.

It is not an unprimeable number, because it can be changed into a prime (1211130241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875670 + ... + 877051.

It is an arithmetic number, because the mean of its divisors is an integer number (303220906).

Almost surely, 2^1211130211 is an apocalyptic number.

1211130211 is a deficient number, since it is larger than the sum of its proper divisors (1753413).

1211130211 is an equidigital number, since it uses as much as digits as its factorization.

1211130211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753412.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1211130211 is about 34801.2961109209. The cubic root of 1211130211 is about 1065.9339118588.

Adding to 1211130211 its reverse (1120311121), we get a palindrome (2331441332).

The spelling of 1211130211 in words is "one billion, two hundred eleven million, one hundred thirty thousand, two hundred eleven".