421110905 has 4 divisors (see below), whose sum is σ = 505333092. Its totient is φ = 336888720.

The previous prime is 421110857. The next prime is 421110947. The reversal of 421110905 is 509011124.

It is a happy number.

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 115175824 + 305935081 = 10732^2 + 17491^2 .

It is not a de Polignac number, because 421110905 - 2⁸ = 421110649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42111086 + ... + 42111095.

It is an arithmetic number, because the mean of its divisors is an integer number (126333273).

Almost surely, 2^421110905 is an apocalyptic number.

It is an amenable number.

421110905 is a deficient number, since it is larger than the sum of its proper divisors (84222187).

421110905 is an equidigital number, since it uses as much as digits as its factorization.

421110905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84222186.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 421110905 is about 20520.9869402034. The cubic root of 421110905 is about 749.5469293207.

The spelling of 421110905 in words is "four hundred twenty-one million, one hundred ten thousand, nine hundred five".