11211111111211 has 8 divisors (see below), whose sum is σ = 12351395140848. Its totient is φ = 10091009100000.

The previous prime is 11211111111209. The next prime is 11211111111223.

11211111111211 is nontrivially palindromic in base 10.

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 11211111111211 - 2¹ = 11211111111209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11211111111511) 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, 5045503440 + ... + 5045505661.

It is an arithmetic number, because the mean of its divisors is an integer number (1543924392606).

Almost surely, 2^{11211111111211} is an apocalyptic number.

11211111111211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11211111111211 is a deficient number, since it is larger than the sum of its proper divisors (1140284029637).

11211111111211 is a wasteful number, since it uses less digits than its factorization.

11211111111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10091009213.

The product of its digits is 4, while the sum is 16.

It can be divided in two parts, 1121111 and 1111211, that added together give a palindrome (2232322).

The spelling of 11211111111211 in words is "eleven trillion, two hundred eleven billion, one hundred eleven million, one hundred eleven thousand, two hundred eleven".