2001013321 has 4 divisors (see below), whose sum is σ = 2007843012. Its totient is φ = 1994183632.

The previous prime is 2001013307. The next prime is 2001013337. The reversal of 2001013321 is 1233101002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1523809296 + 477204025 = 39036^2 + 21845^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001013321 - 2²¹ = 1998916169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001013361) 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, 3414406 + ... + 3414991.

It is an arithmetic number, because the mean of its divisors is an integer number (501960753).

Almost surely, 2^2001013321 is an apocalyptic number.

It is an amenable number.

2001013321 is a deficient number, since it is larger than the sum of its proper divisors (6829691).

2001013321 is an equidigital number, since it uses as much as digits as its factorization.

2001013321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6829690.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 2001013321 is about 44732.6873885305. The cubic root of 2001013321 is about 1260.1337980449.

Adding to 2001013321 its reverse (1233101002), we get a palindrome (3234114323).

The spelling of 2001013321 in words is "two billion, one million, thirteen thousand, three hundred twenty-one".