11011221211121 has 4 divisors (see below), whose sum is σ = 11011335421812. Its totient is φ = 11011107000432.

The previous prime is 11011221211091. The next prime is 11011221211157. The reversal of 11011221211121 is 12111212211011.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 907494390625 + 10103726820496 = 952625^2 + 3178636^2 .

It is a cyclic number.

It is not a de Polignac number, because 11011221211121 - 2³⁴ = 10994041341937 is a prime.

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 11011221211121.

It is not an unprimeable number, because it can be changed into a prime (11011221219121) 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, 56960606 + ... + 57153591.

It is an arithmetic number, because the mean of its divisors is an integer number (2752833855453).

Almost surely, 2^{11011221211121} is an apocalyptic number.

It is an amenable number.

11011221211121 is a deficient number, since it is larger than the sum of its proper divisors (114210691).

11011221211121 is an equidigital number, since it uses as much as digits as its factorization.

11011221211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114210690.

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

Adding to 11011221211121 its reverse (12111212211011), we get a palindrome (23122433422132).

The spelling of 11011221211121 in words is "eleven trillion, eleven billion, two hundred twenty-one million, two hundred eleven thousand, one hundred twenty-one".