2001321030243 has 16 divisors (see below), whose sum is σ = 2690078904320. Its totient is φ = 1323393585696.

The previous prime is 2001321030229. The next prime is 2001321030253. The reversal of 2001321030243 is 3420301231002.

It is not a de Polignac number, because 2001321030243 - 2⁸ = 2001321029987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001321030253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 984921 + ... + 2229957.

It is an arithmetic number, because the mean of its divisors is an integer number (168129931520).

Almost surely, 2^{2001321030243} is an apocalyptic number.

2001321030243 is a deficient number, since it is larger than the sum of its proper divisors (688757874077).

2001321030243 is a wasteful number, since it uses less digits than its factorization.

2001321030243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249386.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 2001321030243 its reverse (3420301231002), we get a palindrome (5421622261245).

The spelling of 2001321030243 in words is "two trillion, one billion, three hundred twenty-one million, thirty thousand, two hundred forty-three".