111442421 has 4 divisors (see below), whose sum is σ = 111656844. Its totient is φ = 111228000.

The previous prime is 111442417. The next prime is 111442459. The reversal of 111442421 is 124244111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124244111 = 83 ⋅1496917.

It can be written as a sum of positive squares in 2 ways, for example, as 56460196 + 54982225 = 7514^2 + 7415^2 .

It is a cyclic number.

It is not a de Polignac number, because 111442421 - 2² = 111442417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111442393 and 111442402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111442481) 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, 106430 + ... + 107471.

It is an arithmetic number, because the mean of its divisors is an integer number (27914211).

Almost surely, 2^111442421 is an apocalyptic number.

It is an amenable number.

111442421 is a deficient number, since it is larger than the sum of its proper divisors (214423).

111442421 is an equidigital number, since it uses as much as digits as its factorization.

111442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214422.

The product of its digits is 256, while the sum is 20.

The square root of 111442421 is about 10556.6292442237. The cubic root of 111442421 is about 481.2272141683.

Adding to 111442421 its reverse (124244111), we get a palindrome (235686532).

The spelling of 111442421 in words is "one hundred eleven million, four hundred forty-two thousand, four hundred twenty-one".