2001443221 has 4 divisors (see below), whose sum is σ = 2001538444. Its totient is φ = 2001348000.

The previous prime is 2001443209. The next prime is 2001443237. The reversal of 2001443221 is 1223441002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1559855025 + 441588196 = 39495^2 + 21014^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001443221 - 2⁵ = 2001443189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001443321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 630 + ... + 63271.

It is an arithmetic number, because the mean of its divisors is an integer number (500384611).

Almost surely, 2^2001443221 is an apocalyptic number.

It is an amenable number.

2001443221 is a deficient number, since it is larger than the sum of its proper divisors (95223).

2001443221 is an equidigital number, since it uses as much as digits as its factorization.

2001443221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95222.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 2001443221 is about 44737.4923414355. The cubic root of 2001443221 is about 1260.2240344472.

Adding to 2001443221 its reverse (1223441002), we get a palindrome (3224884223).

The spelling of 2001443221 in words is "two billion, one million, four hundred forty-three thousand, two hundred twenty-one".