421365205 has 4 divisors (see below), whose sum is σ = 505638252. Its totient is φ = 337092160.

The previous prime is 421365193. The next prime is 421365229. The reversal of 421365205 is 502563124.

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 325658116 + 95707089 = 18046^2 + 9783^2 .

It is not a de Polignac number, because 421365205 - 2⁵ = 421365173 is a prime.

It is a Duffinian number.

It is a congruent 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, 42136516 + ... + 42136525.

It is an arithmetic number, because the mean of its divisors is an integer number (126409563).

Almost surely, 2^421365205 is an apocalyptic number.

It is an amenable number.

421365205 is a deficient number, since it is larger than the sum of its proper divisors (84273047).

421365205 is an equidigital number, since it uses as much as digits as its factorization.

421365205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84273046.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 421365205 is about 20527.1821008145. The cubic root of 421365205 is about 749.6977774910.

The spelling of 421365205 in words is "four hundred twenty-one million, three hundred sixty-five thousand, two hundred five".