1211211112211 has 16 divisors (see below), whose sum is σ = 1292640703200. Its totient is φ = 1130931509760.

The previous prime is 1211211112201. The next prime is 1211211112219. The reversal of 1211211112211 is 1122111121121.

It is a cyclic number.

It is not a de Polignac number, because 1211211112211 - 2⁶ = 1211211112147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 1211211112211.

It is not an unprimeable number, because it can be changed into a prime (1211211112219) 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, 1788380 + ... + 2370806.

It is an arithmetic number, because the mean of its divisors is an integer number (80790043950).

Almost surely, 2^{1211211112211} is an apocalyptic number.

1211211112211 is a deficient number, since it is larger than the sum of its proper divisors (81429590989).

1211211112211 is a wasteful number, since it uses less digits than its factorization.

1211211112211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583414.

The product of its digits is 16, while the sum is 17.

Adding to 1211211112211 its reverse (1122111121121), we get a palindrome (2333322233332).

The spelling of 1211211112211 in words is "one trillion, two hundred eleven billion, two hundred eleven million, one hundred twelve thousand, two hundred eleven".