11201021221121 has 4 divisors (see below), whose sum is σ = 11201042062932. Its totient is φ = 11201000379312.

The previous prime is 11201021221081. The next prime is 11201021221147. The reversal of 11201021221121 is 12112212010211.

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 7835319098896 + 3365702122225 = 2799164^2 + 1834585^2 .

It is a cyclic number.

It is not a de Polignac number, because 11201021221121 - 2¹⁰ = 11201021220097 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 11201021221121.

It is not an unprimeable number, because it can be changed into a prime (11201021221151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9592826 + ... + 10696931.

It is an arithmetic number, because the mean of its divisors is an integer number (2800260515733).

Almost surely, 2^{11201021221121} is an apocalyptic number.

It is an amenable number.

11201021221121 is a deficient number, since it is larger than the sum of its proper divisors (20841811).

11201021221121 is an equidigital number, since it uses as much as digits as its factorization.

11201021221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20841810.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11201021221121 its reverse (12112212010211), we get a palindrome (23313233231332).

The spelling of 11201021221121 in words is "eleven trillion, two hundred one billion, twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".