2001031321 has 2 divisors, whose sum is σ = 2001031322. Its totient is φ = 2001031320.

The previous prime is 2001031309. The next prime is 2001031327. The reversal of 2001031321 is 1231301002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1990141321 + 10890000 = 44611^2 + 3300^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001031321 - 2²¹ = 1998934169 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001031327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000515660 + 1000515661.

It is an arithmetic number, because the mean of its divisors is an integer number (1000515661).

Almost surely, 2^2001031321 is an apocalyptic number.

It is an amenable number.

2001031321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001031321 is an equidigital number, since it uses as much as digits as its factorization.

2001031321 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2001031321 is about 44732.8885832337. Note that the first 3 decimals coincide. The cubic root of 2001031321 is about 1260.1375765206.

Adding to 2001031321 its reverse (1231301002), we get a palindrome (3232332323).

The spelling of 2001031321 in words is "two billion, one million, thirty-one thousand, three hundred twenty-one".