111121123321 has 4 divisors (see below), whose sum is σ = 119668902052. Its totient is φ = 102573344592.

The previous prime is 111121123291. The next prime is 111121123361. The reversal of 111121123321 is 123321121111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123321121111 = 31 ⋅3978100681.

It can be written as a sum of positive squares in 2 ways, for example, as 46770117696 + 64351005625 = 216264^2 + 253675^2 .

It is a cyclic number.

It is not a de Polignac number, because 111121123321 - 2²¹ = 111119026169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111121123361) 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, 4273889346 + ... + 4273889371.

It is an arithmetic number, because the mean of its divisors is an integer number (29917225513).

Almost surely, 2^111121123321 is an apocalyptic number.

It is an amenable number.

111121123321 is a deficient number, since it is larger than the sum of its proper divisors (8547778731).

111121123321 is an equidigital number, since it uses as much as digits as its factorization.

111121123321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8547778730.

The product of its digits is 72, while the sum is 19.

Adding to 111121123321 its reverse (123321121111), we get a palindrome (234442244432).

The spelling of 111121123321 in words is "one hundred eleven billion, one hundred twenty-one million, one hundred twenty-three thousand, three hundred twenty-one".