11201121220021 has 4 divisors (see below), whose sum is σ = 11201782577292. Its totient is φ = 11200459862752.

The previous prime is 11201121220001. The next prime is 11201121220033. The reversal of 11201121220021 is 12002212110211.

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 5094563608996 + 6106557611025 = 2257114^2 + 2471145^2 .

It is a cyclic number.

It is not a de Polignac number, because 11201121220021 - 2¹¹ = 11201121217973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11201121219977 and 11201121220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11201121220001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330653230 + ... + 330687103.

It is an arithmetic number, because the mean of its divisors is an integer number (2800445644323).

Almost surely, 2^{11201121220021} is an apocalyptic number.

It is an amenable number.

11201121220021 is a deficient number, since it is larger than the sum of its proper divisors (661357271).

11201121220021 is an equidigital number, since it uses as much as digits as its factorization.

11201121220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661357270.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 11201121220021 its reverse (12002212110211), we get a palindrome (23203333330232).

The spelling of 11201121220021 in words is "eleven trillion, two hundred one billion, one hundred twenty-one million, two hundred twenty thousand, twenty-one".