2005421205 has 16 divisors (see below), whose sum is σ = 3209261184. Its totient is φ = 1069362240.

The previous prime is 2005421189. The next prime is 2005421219. The reversal of 2005421205 is 5021245002.

It is a happy number.

It is not a de Polignac number, because 2005421205 - 2⁴ = 2005421189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115440 + ... + 131670.

It is an arithmetic number, because the mean of its divisors is an integer number (200578824).

Almost surely, 2^2005421205 is an apocalyptic number.

It is an amenable number.

2005421205 is a deficient number, since it is larger than the sum of its proper divisors (1203839979).

2005421205 is a wasteful number, since it uses less digits than its factorization.

2005421205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24476.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 2005421205 is about 44781.9294470437. The cubic root of 2005421205 is about 1261.0584045901.

Adding to 2005421205 its reverse (5021245002), we get a palindrome (7026666207).

The spelling of 2005421205 in words is "two billion, five million, four hundred twenty-one thousand, two hundred five".