111120122111221 has 4 divisors (see below), whose sum is σ = 111122731281100. Its totient is φ = 111117512941344.

The previous prime is 111120122111213. The next prime is 111120122111249. The reversal of 111120122111221 is 122111221021111.

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 46409134380625 + 64710987730596 = 6812425^2 + 8044314^2 .

It is a cyclic number.

It is not a de Polignac number, because 111120122111221 - 2³ = 111120122111213 is a prime.

It is a super-2 number, since 2×111120122111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111120122111321) 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, 1304521056 + ... + 1304606233.

It is an arithmetic number, because the mean of its divisors is an integer number (27780682820275).

Almost surely, 2^{111120122111221} is an apocalyptic number.

It is an amenable number.

111120122111221 is a deficient number, since it is larger than the sum of its proper divisors (2609169879).

111120122111221 is an equidigital number, since it uses as much as digits as its factorization.

111120122111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2609169878.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111120122111221 its reverse (122111221021111), we get a palindrome (233231343132332).

The spelling of 111120122111221 in words is "one hundred eleven trillion, one hundred twenty billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".