111123013121 has 4 divisors (see below), whose sum is σ = 111228946500. Its totient is φ = 111017079744.

The previous prime is 111123013037. The next prime is 111123013129. The reversal of 111123013121 is 121310321111.

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 55762099600 + 55360913521 = 236140^2 + 235289^2 .

It is a cyclic number.

It is not a de Polignac number, because 111123013121 - 2¹⁴ = 111122996737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111123013121.

It is not an unprimeable number, because it can be changed into a prime (111123013129) 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, 52965116 + ... + 52967213.

It is an arithmetic number, because the mean of its divisors is an integer number (27807236625).

Almost surely, 2^111123013121 is an apocalyptic number.

It is an amenable number.

111123013121 is a deficient number, since it is larger than the sum of its proper divisors (105933379).

111123013121 is a wasteful number, since it uses less digits than its factorization.

111123013121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105933378.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 111123013121 its reverse (121310321111), we get a palindrome (232433334232).

The spelling of 111123013121 in words is "one hundred eleven billion, one hundred twenty-three million, thirteen thousand, one hundred twenty-one".