11221201121 has 4 divisors (see below), whose sum is σ = 12084370452. Its totient is φ = 10358031792.

The previous prime is 11221201111. The next prime is 11221201129. The reversal of 11221201121 is 12110212211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12110212211 = 27611 ⋅438601.

It can be written as a sum of positive squares in 2 ways, for example, as 7146166225 + 4075034896 = 84535^2 + 63836^2 .

It is a cyclic number.

It is not a de Polignac number, because 11221201121 - 2¹⁰ = 11221200097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11221201096 and 11221201105.

It is not an unprimeable number, because it can be changed into a prime (11221201129) 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, 431584646 + ... + 431584671.

It is an arithmetic number, because the mean of its divisors is an integer number (3021092613).

Almost surely, 2^11221201121 is an apocalyptic number.

It is an amenable number.

11221201121 is a deficient number, since it is larger than the sum of its proper divisors (863169331).

11221201121 is an equidigital number, since it uses as much as digits as its factorization.

11221201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863169330.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11221201121 its reverse (12110212211), we get a palindrome (23331413332).

The spelling of 11221201121 in words is "eleven billion, two hundred twenty-one million, two hundred one thousand, one hundred twenty-one".