2001221333 has 4 divisors (see below), whose sum is σ = 2047761408. Its totient is φ = 1954681260.

The previous prime is 2001221323. The next prime is 2001221363. The reversal of 2001221333 is 3331221002.

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 not a de Polignac number, because 2001221333 - 2⁸ = 2001221077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001221323) 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 3 ways as a sum of consecutive naturals, for example, 23269973 + ... + 23270058.

It is an arithmetic number, because the mean of its divisors is an integer number (511940352).

Almost surely, 2^2001221333 is an apocalyptic number.

It is an amenable number.

2001221333 is a deficient number, since it is larger than the sum of its proper divisors (46540075).

2001221333 is an equidigital number, since it uses as much as digits as its factorization.

2001221333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46540074.

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

The square root of 2001221333 is about 44735.0123840376. The cubic root of 2001221333 is about 1260.1774615672.

Adding to 2001221333 its reverse (3331221002), we get a palindrome (5332442335).

The spelling of 2001221333 in words is "two billion, one million, two hundred twenty-one thousand, three hundred thirty-three".