111211122211221 has 32 divisors (see below), whose sum is σ = 149268590254080. Its totient is φ = 73648581955200.

The previous prime is 111211122211181. The next prime is 111211122211271. The reversal of 111211122211221 is 122112221112111.

It is not a de Polignac number, because 111211122211221 - 2¹⁹ = 111211121686933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211122211271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2885358676 + ... + 2885397218.

It is an arithmetic number, because the mean of its divisors is an integer number (4664643445440).

Almost surely, 2^{111211122211221} is an apocalyptic number.

It is an amenable number.

111211122211221 is a deficient number, since it is larger than the sum of its proper divisors (38057468042859).

111211122211221 is a wasteful number, since it uses less digits than its factorization.

111211122211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47337.

The product of its digits is 64, while the sum is 21.

Adding to 111211122211221 its reverse (122112221112111), we get a palindrome (233323343323332).

The spelling of 111211122211221 in words is "one hundred eleven trillion, two hundred eleven billion, one hundred twenty-two million, two hundred eleven thousand, two hundred twenty-one".