2005421 has 8 divisors (see below), whose sum is σ = 2258688. Its totient is φ = 1764000.

The previous prime is 2005417. The next prime is 2005427. The reversal of 2005421 is 1245002.

2005421 is nontrivially palindromic in base 4.

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 2005421 - 2² = 2005417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2005396 and 2005405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005427) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2600 + ... + 3281.

It is an arithmetic number, because the mean of its divisors is an integer number (282336).

2^2005421 is an apocalyptic number.

It is an amenable number.

2005421 is a deficient number, since it is larger than the sum of its proper divisors (253267).

2005421 is a wasteful number, since it uses less digits than its factorization.

2005421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5923.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 2005421 is about 1416.1288783158. The cubic root of 2005421 is about 126.1058361620.

The spelling of 2005421 in words is "two million, five thousand, four hundred twenty-one".