421091 has 4 divisors (see below), whose sum is σ = 459384. Its totient is φ = 382800.

The previous prime is 421081. The next prime is 421093. The reversal of 421091 is 190124.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-421091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421093) 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, 19130 + ... + 19151.

It is an arithmetic number, because the mean of its divisors is an integer number (114846).

2⁴²¹⁰⁹¹ is an apocalyptic number.

421091 is a deficient number, since it is larger than the sum of its proper divisors (38293).

421091 is a wasteful number, since it uses less digits than its factorization.

421091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38292.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 421091 is about 648.9152487036. The cubic root of 421091 is about 74.9535119315.

The spelling of 421091 in words is "four hundred twenty-one thousand, ninety-one".