111142321 has 4 divisors (see below), whose sum is σ = 111171312. Its totient is φ = 111113332.

The previous prime is 111142303. The next prime is 111142337. The reversal of 111142321 is 123241111.

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: 123241111 = 7 ⋅17605873.

It is a cyclic number.

It is not a de Polignac number, because 111142321 - 2⁹ = 111141809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111142295 and 111142304.

It is not an unprimeable number, because it can be changed into a prime (111142621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7675 + ... + 16768.

It is an arithmetic number, because the mean of its divisors is an integer number (27792828).

Almost surely, 2^111142321 is an apocalyptic number.

It is an amenable number.

111142321 is a deficient number, since it is larger than the sum of its proper divisors (28991).

111142321 is an equidigital number, since it uses as much as digits as its factorization.

111142321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28990.

The product of its digits is 48, while the sum is 16.

The square root of 111142321 is about 10542.4058449673. The cubic root of 111142321 is about 480.7948650041.

Adding to 111142321 its reverse (123241111), we get a palindrome (234383432).

The spelling of 111142321 in words is "one hundred eleven million, one hundred forty-two thousand, three hundred twenty-one".