421214809 has 4 divisors (see below), whose sum is σ = 425151504. Its totient is φ = 417278116.

The previous prime is 421214803. The next prime is 421214851. The reversal of 421214809 is 908412124.

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.

It is a cyclic number.

It is not a de Polignac number, because 421214809 - 2⁷ = 421214681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421214803) 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, 1968187 + ... + 1968400.

It is an arithmetic number, because the mean of its divisors is an integer number (106287876).

Almost surely, 2^421214809 is an apocalyptic number.

It is an amenable number.

421214809 is a deficient number, since it is larger than the sum of its proper divisors (3936695).

421214809 is a wasteful number, since it uses less digits than its factorization.

421214809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3936694.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 421214809 is about 20523.5184361746. The cubic root of 421214809 is about 749.6085714508.

The spelling of 421214809 in words is "four hundred twenty-one million, two hundred fourteen thousand, eight hundred nine".