11211211211211 has 24 divisors (see below), whose sum is σ = 17667508111344. Its totient is φ = 6794151495360.

The previous prime is 11211211211209. The next prime is 11211211211237.

11211211211211 is a `hidden beast` number, since 1 + 121 + 121 + 1 + 211 + 211 = 666.

11211211211211 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 11211211211211 - 2¹ = 11211211211209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11211211211111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3052536 + ... + 5633861.

It is an arithmetic number, because the mean of its divisors is an integer number (736146171306).

Almost surely, 2^{11211211211211} is an apocalyptic number.

11211211211211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11211211211211 is a deficient number, since it is larger than the sum of its proper divisors (6456296900133).

11211211211211 is a wasteful number, since it uses less digits than its factorization.

11211211211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8699451 (or 8699448 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

It can be divided in two parts, 1121121 and 1211211, that added together give a palindrome (2332332).

The spelling of 11211211211211 in words is "eleven trillion, two hundred eleven billion, two hundred eleven million, two hundred eleven thousand, two hundred eleven".