111421 has 4 divisors (see below), whose sum is σ = 113152. Its totient is φ = 109692.

The previous prime is 111409. The next prime is 111427. The reversal of 111421 is 124111.

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: 124111 = 13 ⋅9547.

It is a cyclic number.

It is not a de Polignac number, because 111421 - 2⁹ = 110909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111398 and 111407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 765 + ... + 898.

It is an arithmetic number, because the mean of its divisors is an integer number (28288).

2¹¹¹⁴²¹ is an apocalyptic number.

It is an amenable number.

111421 is a deficient number, since it is larger than the sum of its proper divisors (1731).

111421 is an equidigital number, since it uses as much as digits as its factorization.

111421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730.

The product of its digits is 8, while the sum is 10.

The square root of 111421 is about 333.7978430128. The cubic root of 111421 is about 48.1196379026.

Adding to 111421 its reverse (124111), we get a palindrome (235532).

The spelling of 111421 in words is "one hundred eleven thousand, four hundred twenty-one", and thus it is an iban number.