11112110112221 has 4 divisors (see below), whose sum is σ = 11765763648252. Its totient is φ = 10458456576192.

The previous prime is 11112110112193. The next prime is 11112110112227. The reversal of 11112110112221 is 12221101121111.

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 3332501364196 + 7779608748025 = 1825514^2 + 2789195^2 .

It is a cyclic number.

It is not a de Polignac number, because 11112110112221 - 2¹⁸ = 11112109850077 is a prime.

It is a super-2 number, since 2×11112110112221² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 653653536013 = 11112110112221 / (1 + 1 + 1 + 1 + 2 + 1 + 1 + 0 + 1 + 1 + 2 + 2 + 2 + 1).

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 11112110112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112110112227) 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, 326826767990 + ... + 326826768023.

It is an arithmetic number, because the mean of its divisors is an integer number (2941440912063).

Almost surely, 2^{11112110112221} is an apocalyptic number.

It is an amenable number.

11112110112221 is a deficient number, since it is larger than the sum of its proper divisors (653653536031).

11112110112221 is an equidigital number, since it uses as much as digits as its factorization.

11112110112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653653536030.

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

Adding to 11112110112221 its reverse (12221101121111), we get a palindrome (23333211233332).

The spelling of 11112110112221 in words is "eleven trillion, one hundred twelve billion, one hundred ten million, one hundred twelve thousand, two hundred twenty-one".