2001321233 has 32 divisors (see below), whose sum is σ = 2178731520. Its totient is φ = 1834560000.

The previous prime is 2001321187. The next prime is 2001321251. The reversal of 2001321233 is 3321231002.

It is a cyclic number.

It is not a de Polignac number, because 2001321233 - 2²⁰ = 2000272657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001321293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12747191 + ... + 12747347.

It is an arithmetic number, because the mean of its divisors is an integer number (68085360).

Almost surely, 2^2001321233 is an apocalyptic number.

It is an amenable number.

2001321233 is a deficient number, since it is larger than the sum of its proper divisors (177410287).

2001321233 is a wasteful number, since it uses less digits than its factorization.

2001321233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 2001321233 is about 44736.1289451826. The cubic root of 2001321233 is about 1260.1984303679.

Adding to 2001321233 its reverse (3321231002), we get a palindrome (5322552235).

The spelling of 2001321233 in words is "two billion, one million, three hundred twenty-one thousand, two hundred thirty-three".