111425421 has 4 divisors (see below), whose sum is σ = 148567232. Its totient is φ = 74283612.

The previous prime is 111425417. The next prime is 111425437. The reversal of 111425421 is 124524111.

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: 124524111 = 3 ⋅41508037.

It is not a de Polignac number, because 111425421 - 2² = 111425417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111425401) 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, 18570901 + ... + 18570906.

It is an arithmetic number, because the mean of its divisors is an integer number (37141808).

Almost surely, 2^111425421 is an apocalyptic number.

It is an amenable number.

111425421 is a deficient number, since it is larger than the sum of its proper divisors (37141811).

111425421 is an equidigital number, since it uses as much as digits as its factorization.

111425421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37141810.

The product of its digits is 320, while the sum is 21.

The square root of 111425421 is about 10555.8240322582. The cubic root of 111425421 is about 481.2027432993.

Adding to 111425421 its reverse (124524111), we get a palindrome (235949532).

The spelling of 111425421 in words is "one hundred eleven million, four hundred twenty-five thousand, four hundred twenty-one".