2001000321 has 16 divisors (see below), whose sum is σ = 2965878720. Its totient is φ = 1333355040.

The previous prime is 2001000311. The next prime is 2001000341. The reversal of 2001000321 is 1230001002.

It is a happy number.

It is not a de Polignac number, because 2001000321 - 2²¹ = 1998903169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (2001000301) 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, 42661 + ... + 76301.

It is an arithmetic number, because the mean of its divisors is an integer number (185367420).

Almost surely, 2^2001000321 is an apocalyptic number.

It is an amenable number.

2001000321 is a deficient number, since it is larger than the sum of its proper divisors (964878399).

2001000321 is a wasteful number, since it uses less digits than its factorization.

2001000321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35853 (or 35847 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 2001000321 is about 44732.5420806822. The cubic root of 2001000321 is about 1260.1310691317.

Adding to 2001000321 its reverse (1230001002), we get a palindrome (3231001323).

The spelling of 2001000321 in words is "two billion, one million, three hundred twenty-one", and thus it is an aban number.