2001023231321 has 4 divisors (see below), whose sum is σ = 2001089156352. Its totient is φ = 2000957306292.

The previous prime is 2001023231297. The next prime is 2001023231461. The reversal of 2001023231321 is 1231323201002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001023231321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001023231293 and 2001023231302.

It is not an unprimeable number, because it can be changed into a prime (2001023231621) 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, 32916965 + ... + 32977698.

It is an arithmetic number, because the mean of its divisors is an integer number (500272289088).

Almost surely, 2^{2001023231321} is an apocalyptic number.

It is an amenable number.

2001023231321 is a deficient number, since it is larger than the sum of its proper divisors (65925031).

2001023231321 is an equidigital number, since it uses as much as digits as its factorization.

2001023231321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65925030.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 2001023231321 its reverse (1231323201002), we get a palindrome (3232346432323).

The spelling of 2001023231321 in words is "two trillion, one billion, twenty-three million, two hundred thirty-one thousand, three hundred twenty-one".