111223312121 has 4 divisors (see below), whose sum is σ = 111559334544. Its totient is φ = 110887289700.

The previous prime is 111223312099. The next prime is 111223312139. The reversal of 111223312121 is 121213322111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121213322111 = 7 ⋅17316188873.

It is a cyclic number.

It is not a de Polignac number, because 111223312121 - 2¹⁰ = 111223311097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111223312093 and 111223312102.

It is not an unprimeable number, because it can be changed into a prime (111223312171) 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, 168010715 + ... + 168011376.

It is an arithmetic number, because the mean of its divisors is an integer number (27889833636).

Almost surely, 2^111223312121 is an apocalyptic number.

It is an amenable number.

111223312121 is a deficient number, since it is larger than the sum of its proper divisors (336022423).

111223312121 is an equidigital number, since it uses as much as digits as its factorization.

111223312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336022422.

The product of its digits is 144, while the sum is 20.

Adding to 111223312121 its reverse (121213322111), we get a palindrome (232436634232).

The spelling of 111223312121 in words is "one hundred eleven billion, two hundred twenty-three million, three hundred twelve thousand, one hundred twenty-one".