1211211211 has 8 divisors (see below), whose sum is σ = 1444425984. Its totient is φ = 993042600.

The previous prime is 1211211203. The next prime is 1211211283. The reversal of 1211211211 is 1121121121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211211211 - 2³ = 1211211203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211211191 and 1211211200.

It is not an unprimeable number, because it can be changed into a prime (1211211011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3761365 + ... + 3761686.

It is an arithmetic number, because the mean of its divisors is an integer number (180553248).

Almost surely, 2^1211211211 is an apocalyptic number.

1211211211 is a deficient number, since it is larger than the sum of its proper divisors (233214773).

1211211211 is an equidigital number, since it uses as much as digits as its factorization.

1211211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7523081.

The product of its digits is 8, while the sum is 13.

The square root of 1211211211 is about 34802.4598412239. The cubic root of 1211211211 is about 1065.9576744351.

Adding to 1211211211 its reverse (1121121121), we get a palindrome (2332332332).

The spelling of 1211211211 in words is "one billion, two hundred eleven million, two hundred eleven thousand, two hundred eleven".