1211143211 has 4 divisors (see below), whose sum is σ = 1252906800. Its totient is φ = 1169379624.

The previous prime is 1211143183. The next prime is 1211143229. The reversal of 1211143211 is 1123411121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1123411121 = 7 ⋅160487303.

It is a cyclic number.

It is not a de Polignac number, because 1211143211 - 2¹⁴ = 1211126827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211143211.

It is not an unprimeable number, because it can be changed into a prime (1211143231) 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, 20881751 + ... + 20881808.

It is an arithmetic number, because the mean of its divisors is an integer number (313226700).

Almost surely, 2^1211143211 is an apocalyptic number.

1211143211 is a deficient number, since it is larger than the sum of its proper divisors (41763589).

1211143211 is an equidigital number, since it uses as much as digits as its factorization.

1211143211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41763588.

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

The square root of 1211143211 is about 34801.4828850726. The cubic root of 1211143211 is about 1065.9377256770.

Adding to 1211143211 its reverse (1123411121), we get a palindrome (2334554332).

The spelling of 1211143211 in words is "one billion, two hundred eleven million, one hundred forty-three thousand, two hundred eleven".