1211122211 has 16 divisors (see below), whose sum is σ = 1384488000. Its totient is φ = 1049545728.

The previous prime is 1211122207. The next prime is 1211122261. The reversal of 1211122211 is 1122211121.

It is not a de Polignac number, because 1211122211 - 2² = 1211122207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211122261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83690 + ... + 97088.

It is an arithmetic number, because the mean of its divisors is an integer number (86530500).

Almost surely, 2^1211122211 is an apocalyptic number.

1211122211 is a deficient number, since it is larger than the sum of its proper divisors (173365789).

1211122211 is a wasteful number, since it uses less digits than its factorization.

1211122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13838.

The product of its digits is 16, while the sum is 14.

The square root of 1211122211 is about 34801.1811724832. The cubic root of 1211122211 is about 1065.9315648802.

Adding to 1211122211 its reverse (1122211121), we get a palindrome (2333333332).

It can be divided in two parts, 121 and 1122211, that multiplied together give a palindrome (135787531).

The spelling of 1211122211 in words is "one billion, two hundred eleven million, one hundred twenty-two thousand, two hundred eleven".