2001321444 has 24 divisors (see below), whose sum is σ = 4703349280. Its totient is φ = 662307264.

The previous prime is 2001321431. The next prime is 2001321449. The reversal of 2001321444 is 4441231002.

It is a self number, because there is not a number n which added to its sum of digits gives 2001321444.

It is not an unprimeable number, because it can be changed into a prime (2001321449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 598249 + ... + 601584.

Almost surely, 2^2001321444 is an apocalyptic number.

It is an amenable number.

2001321444 is an abundant number, since it is smaller than the sum of its proper divisors (2702027836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2001321444 is a wasteful number, since it uses less digits than its factorization.

2001321444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199979 (or 1199977 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 2001321444 is about 44736.1313034554. The cubic root of 2001321444 is about 1260.1984746556.

Adding to 2001321444 its reverse (4441231002), we get a palindrome (6442552446).

The spelling of 2001321444 in words is "two billion, one million, three hundred twenty-one thousand, four hundred forty-four".