421304405 has 4 divisors (see below), whose sum is σ = 505565292. Its totient is φ = 337043520.

The previous prime is 421304357. The next prime is 421304437. The reversal of 421304405 is 504403124.

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 222099409 + 199204996 = 14903^2 + 14114^2 .

It is not a de Polignac number, because 421304405 - 2¹⁰ = 421303381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42130436 + ... + 42130445.

It is an arithmetic number, because the mean of its divisors is an integer number (126391323).

Almost surely, 2^421304405 is an apocalyptic number.

It is an amenable number.

421304405 is a deficient number, since it is larger than the sum of its proper divisors (84260887).

421304405 is an equidigital number, since it uses as much as digits as its factorization.

421304405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84260886.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 421304405 is about 20525.7010842504. The cubic root of 421304405 is about 749.6617170721.

Adding to 421304405 its reverse (504403124), we get a palindrome (925707529).

The spelling of 421304405 in words is "four hundred twenty-one million, three hundred four thousand, four hundred five".