421105 has 4 divisors (see below), whose sum is σ = 505332. Its totient is φ = 336880.

The previous prime is 421103. The next prime is 421121. The reversal of 421105 is 501124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 323761 + 97344 = 569^2 + 312^2 .

It is not a de Polignac number, because 421105 - 2¹ = 421103 is a prime.

It is a Duffinian number.

421105 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (421103) 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, 42106 + ... + 42115.

It is an arithmetic number, because the mean of its divisors is an integer number (126333).

2⁴²¹¹⁰⁵ is an apocalyptic number.

It is an amenable number.

421105 is a deficient number, since it is larger than the sum of its proper divisors (84227).

421105 is an equidigital number, since it uses as much as digits as its factorization.

421105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84226.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 421105 is about 648.9260358469. The cubic root of 421105 is about 74.9543425813.

Adding to 421105 its reverse (501124), we get a palindrome (922229).

The spelling of 421105 in words is "four hundred twenty-one thousand, one hundred five".