2006321 has 4 divisors (see below), whose sum is σ = 2009700. Its totient is φ = 2002944.

The previous prime is 2006317. The next prime is 2006339. The reversal of 2006321 is 1236002.

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 874225 + 1132096 = 935^2 + 1064^2 .

It is a cyclic number.

It is not a de Polignac number, because 2006321 - 2² = 2006317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2006296 and 2006305.

It is not an unprimeable number, because it can be changed into a prime (2006341) 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, 536 + ... + 2073.

It is an arithmetic number, because the mean of its divisors is an integer number (502425).

2^2006321 is an apocalyptic number.

It is an amenable number.

2006321 is a deficient number, since it is larger than the sum of its proper divisors (3379).

2006321 is an equidigital number, since it uses as much as digits as its factorization.

2006321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 2006321 is about 1416.4466103599. The cubic root of 2006321 is about 126.1246980832.

The spelling of 2006321 in words is "two million, six thousand, three hundred twenty-one".