11112012122221 has 4 divisors (see below), whose sum is σ = 11236866191100. Its totient is φ = 10987158053344.

The previous prime is 11112012122213. The next prime is 11112012122311. The reversal of 11112012122221 is 12222121021111.

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 786522433321 + 10325489688900 = 886861^2 + 3213330^2 .

It is a cyclic number.

It is not a de Polignac number, because 11112012122221 - 2³ = 11112012122213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112012122201) 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, 62427034306 + ... + 62427034483.

It is an arithmetic number, because the mean of its divisors is an integer number (2809216547775).

Almost surely, 2^{11112012122221} is an apocalyptic number.

It is an amenable number.

11112012122221 is a deficient number, since it is larger than the sum of its proper divisors (124854068879).

11112012122221 is an equidigital number, since it uses as much as digits as its factorization.

11112012122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124854068878.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11112012122221 its reverse (12222121021111), we get a palindrome (23334133143332).

The spelling of 11112012122221 in words is "eleven trillion, one hundred twelve billion, twelve million, one hundred twenty-two thousand, two hundred twenty-one".