4221005 has 4 divisors (see below), whose sum is σ = 5065212. Its totient is φ = 3376800.

The previous prime is 4220987. The next prime is 4221011. The reversal of 4221005 is 5001224.

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 2630884 + 1590121 = 1622^2 + 1261^2 .

It is not a de Polignac number, because 4221005 - 2⁶ = 4220941 is a prime.

It is a Duffinian number.

It is a Curzon 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, 422096 + ... + 422105.

It is an arithmetic number, because the mean of its divisors is an integer number (1266303).

Almost surely, 2^4221005 is an apocalyptic number.

It is an amenable number.

4221005 is a deficient number, since it is larger than the sum of its proper divisors (844207).

4221005 is an equidigital number, since it uses as much as digits as its factorization.

4221005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844206.

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

The square root of 4221005 is about 2054.5084570281. The cubic root of 4221005 is about 161.6113862554.

Adding to 4221005 its reverse (5001224), we get a palindrome (9222229).

The spelling of 4221005 in words is "four million, two hundred twenty-one thousand, five".