11001011220121 has 4 divisors (see below), whose sum is σ = 11847242852452. Its totient is φ = 10154779587792.

The previous prime is 11001011220097. The next prime is 11001011220163. The reversal of 11001011220121 is 12102211010011.

It is a happy number.

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 3345076392025 + 7655934828096 = 1828955^2 + 2766936^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001011220121 - 2⁷ = 11001011219993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 846231632317 = 11001011220121 / (1 + 1 + 0 + 0 + 1 + 0 + 1 + 1 + 2 + 2 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11001011220821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423115816146 + ... + 423115816171.

It is an arithmetic number, because the mean of its divisors is an integer number (2961810713113).

Almost surely, 2^{11001011220121} is an apocalyptic number.

It is an amenable number.

11001011220121 is a deficient number, since it is larger than the sum of its proper divisors (846231632331).

11001011220121 is an equidigital number, since it uses as much as digits as its factorization.

11001011220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846231632330.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11001011220121 its reverse (12102211010011), we get a palindrome (23103222230132).

The spelling of 11001011220121 in words is "eleven trillion, one billion, eleven million, two hundred twenty thousand, one hundred twenty-one".