201311321 has 4 divisors (see below), whose sum is σ = 201648000. Its totient is φ = 200974644.

The previous prime is 201311309. The next prime is 201311323. The reversal of 201311321 is 123113102.

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 a de Polignac number, because none of the positive numbers 2^k-201311321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201311296 and 201311305.

It is not an unprimeable number, because it can be changed into a prime (201311323) 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, 167441 + ... + 168638.

It is an arithmetic number, because the mean of its divisors is an integer number (50412000).

Almost surely, 2^201311321 is an apocalyptic number.

It is an amenable number.

201311321 is a deficient number, since it is larger than the sum of its proper divisors (336679).

201311321 is an equidigital number, since it uses as much as digits as its factorization.

201311321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336678.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 201311321 is about 14188.4220757630. The cubic root of 201311321 is about 586.0788730436.

Adding to 201311321 its reverse (123113102), we get a palindrome (324424423).

The spelling of 201311321 in words is "two hundred one million, three hundred eleven thousand, three hundred twenty-one".