11112122212221 has 16 divisors (see below), whose sum is σ = 14857848904640. Its totient is φ = 7387267754880.

The previous prime is 11112122212199. The next prime is 11112122212231. The reversal of 11112122212221 is 12221222121111.

It is not a de Polignac number, because 11112122212221 - 2⁹ = 11112122211709 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 (11112122212231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2136976 + ... + 5175993.

It is an arithmetic number, because the mean of its divisors is an integer number (928615556540).

Almost surely, 2^{11112122212221} is an apocalyptic number.

It is an amenable number.

11112122212221 is a deficient number, since it is larger than the sum of its proper divisors (3745726692419).

11112122212221 is an equidigital number, since it uses as much as digits as its factorization.

11112122212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7314396.

The product of its digits is 128, while the sum is 21.

Adding to 11112122212221 its reverse (12221222121111), we get a palindrome (23333344333332).

The spelling of 11112122212221 in words is "eleven trillion, one hundred twelve billion, one hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".