1111211211211 has 4 divisors (see below), whose sum is σ = 1111218458400. Its totient is φ = 1111203964024.

The previous prime is 1111211211199. The next prime is 1111211211241. The reversal of 1111211211211 is 1121121121111.

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 1111211211211 - 2¹⁹ = 1111210686923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111211211241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3388516 + ... + 3701953.

It is an arithmetic number, because the mean of its divisors is an integer number (277804614600).

Almost surely, 2^{1111211211211} is an apocalyptic number.

1111211211211 is a deficient number, since it is larger than the sum of its proper divisors (7247189).

1111211211211 is an equidigital number, since it uses as much as digits as its factorization.

1111211211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7247188.

The product of its digits is 8, while the sum is 16.

Adding to 1111211211211 its reverse (1121121121111), we get a palindrome (2232332332322).

It can be divided in two parts, 11 and 11211211211, that multiplied together give a palindrome (123323323321).

The spelling of 1111211211211 in words is "one trillion, one hundred eleven billion, two hundred eleven million, two hundred eleven thousand, two hundred eleven".