421431305 has 8 divisors (see below), whose sum is σ = 532334400. Its totient is φ = 319400496.

The previous prime is 421431301. The next prime is 421431331. The reversal of 421431305 is 503134124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421431305 - 2² = 421431301 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (421431301) 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 7 ways as a sum of consecutive naturals, for example, 2217965 + ... + 2218154.

It is an arithmetic number, because the mean of its divisors is an integer number (66541800).

Almost surely, 2^421431305 is an apocalyptic number.

It is an amenable number.

421431305 is a deficient number, since it is larger than the sum of its proper divisors (110903095).

421431305 is a wasteful number, since it uses less digits than its factorization.

421431305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4436143.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 421431305 is about 20528.7920979292. The cubic root of 421431305 is about 749.7369773992.

Adding to 421431305 its reverse (503134124), we get a palindrome (924565429).

The spelling of 421431305 in words is "four hundred twenty-one million, four hundred thirty-one thousand, three hundred five".