4221001 has 4 divisors (see below), whose sum is σ = 4226692. Its totient is φ = 4215312.

The previous prime is 4220987. The next prime is 4221011. The reversal of 4221001 is 1001224.

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 3367225 + 853776 = 1835^2 + 924^2 .

It is a cyclic number.

It is not a de Polignac number, because 4221001 - 2⁵ = 4220969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4221011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1530 + ... + 3283.

It is an arithmetic number, because the mean of its divisors is an integer number (1056673).

Almost surely, 2^4221001 is an apocalyptic number.

It is an amenable number.

4221001 is a deficient number, since it is larger than the sum of its proper divisors (5691).

4221001 is an equidigital number, since it uses as much as digits as its factorization.

4221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5690.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 4221001 is about 2054.5074835590. The cubic root of 4221001 is about 161.6113352054.

Adding to 4221001 its reverse (1001224), we get a palindrome (5222225).

The spelling of 4221001 in words is "four million, two hundred twenty-one thousand, one".