2221001 has 4 divisors (see below), whose sum is σ = 2224404. Its totient is φ = 2217600.

The previous prime is 2220979. The next prime is 2221007. The reversal of 2221001 is 1001222.

2221001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 115600 + 2105401 = 340^2 + 1451^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221001 - 2¹⁰ = 2219977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2221001.

It is not an unprimeable number, because it can be changed into a prime (2221007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380 + ... + 2141.

It is an arithmetic number, because the mean of its divisors is an integer number (556101).

2^2221001 is an apocalyptic number.

It is an amenable number.

2221001 is a deficient number, since it is larger than the sum of its proper divisors (3403).

2221001 is an equidigital number, since it uses as much as digits as its factorization.

2221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3402.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 2221001 is about 1490.3023183234. The cubic root of 2221001 is about 130.4716790419.

Adding to 2221001 its reverse (1001222), we get a palindrome (3222223).

It can be divided in two parts, 222 and 1001, that multiplied together give a palindrome (222222).

The spelling of 2221001 in words is "two million, two hundred twenty-one thousand, one".