11111221011211 has 8 divisors (see below), whose sum is σ = 11147664384000. Its totient is φ = 11074816349352.

The previous prime is 11111221011193. The next prime is 11111221011217. The reversal of 11111221011211 is 11211012211111.

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 11111221011211 - 2¹⁹ = 11111220486923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111221011217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9102675 + ... + 10250908.

It is an arithmetic number, because the mean of its divisors is an integer number (1393458048000).

Almost surely, 2^{11111221011211} is an apocalyptic number.

11111221011211 is a deficient number, since it is larger than the sum of its proper divisors (36443372789).

11111221011211 is a wasteful number, since it uses less digits than its factorization.

11111221011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19355465.

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

Adding to 11111221011211 its reverse (11211012211111), we get a palindrome (22322233222322).

The spelling of 11111221011211 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, eleven thousand, two hundred eleven".