2005531321 has 4 divisors (see below), whose sum is σ = 2010996352. Its totient is φ = 2000066292.

The previous prime is 2005531291. The next prime is 2005531369. The reversal of 2005531321 is 1231355002.

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 2005531321 - 2²³ = 1997142713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2005531292 and 2005531301.

It is not an unprimeable number, because it can be changed into a prime (2005531421) 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, 2731965 + ... + 2732698.

It is an arithmetic number, because the mean of its divisors is an integer number (502749088).

Almost surely, 2^2005531321 is an apocalyptic number.

It is an amenable number.

2005531321 is a deficient number, since it is larger than the sum of its proper divisors (5465031).

2005531321 is an equidigital number, since it uses as much as digits as its factorization.

2005531321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5465030.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 2005531321 is about 44783.1588993005. The cubic root of 2005531321 is about 1261.0814853882.

Adding to 2005531321 its reverse (1231355002), we get a palindrome (3236886323).

The spelling of 2005531321 in words is "two billion, five million, five hundred thirty-one thousand, three hundred twenty-one".