2001021441 has 16 divisors (see below), whose sum is σ = 2736332928. Its totient is φ = 1299939200.

The previous prime is 2001021433. The next prime is 2001021481. The reversal of 2001021441 is 1441201002.

It is a cyclic number.

It is not a de Polignac number, because 2001021441 - 2³ = 2001021433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001021441.

It is not an unprimeable number, because it can be changed into a prime (2001021481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99931 + ... + 118271.

It is an arithmetic number, because the mean of its divisors is an integer number (171020808).

Almost surely, 2^2001021441 is an apocalyptic number.

It is an amenable number.

2001021441 is a deficient number, since it is larger than the sum of its proper divisors (735311487).

2001021441 is a wasteful number, since it uses less digits than its factorization.

2001021441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19272.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2001021441 is about 44732.7781498087. The cubic root of 2001021441 is about 1260.1355025601.

Adding to 2001021441 its reverse (1441201002), we get a palindrome (3442222443).

The spelling of 2001021441 in words is "two billion, one million, twenty-one thousand, four hundred forty-one".