11122111222221 has 16 divisors (see below), whose sum is σ = 14977814130944. Its totient is φ = 7340915559744.

The previous prime is 11122111222193. The next prime is 11122111222231. The reversal of 11122111222221 is 12222211122111.

11122111222221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11122111222221 - 2¹³ = 11122111214029 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 (11122111222231) 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, 42493765 + ... + 42754698.

It is an arithmetic number, because the mean of its divisors is an integer number (936113383184).

Almost surely, 2^{11122111222221} is an apocalyptic number.

It is an amenable number.

11122111222221 is a deficient number, since it is larger than the sum of its proper divisors (3855702908723).

11122111222221 is a wasteful number, since it uses less digits than its factorization.

11122111222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85248900.

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

Adding to 11122111222221 its reverse (12222211122111), we get a palindrome (23344322344332).

The spelling of 11122111222221 in words is "eleven trillion, one hundred twenty-two billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twenty-one".