111420421 has 4 divisors (see below), whose sum is σ = 127337632. Its totient is φ = 95503212.

The previous prime is 111420401. The next prime is 111420437. The reversal of 111420421 is 124024111.

It is a happy number.

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: 124024111 = 37 ⋅3352003.

It is not a de Polignac number, because 111420421 - 2²⁵ = 77865989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111420395 and 111420404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111420401) 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, 7958595 + ... + 7958608.

It is an arithmetic number, because the mean of its divisors is an integer number (31834408).

Almost surely, 2^111420421 is an apocalyptic number.

It is an amenable number.

111420421 is a deficient number, since it is larger than the sum of its proper divisors (15917211).

111420421 is an equidigital number, since it uses as much as digits as its factorization.

111420421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15917210.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 111420421 is about 10555.5871935198. The cubic root of 111420421 is about 481.1955455112.

Adding to 111420421 its reverse (124024111), we get a palindrome (235444532).

The spelling of 111420421 in words is "one hundred eleven million, four hundred twenty thousand, four hundred twenty-one".