201611321 has 4 divisors (see below), whose sum is σ = 208114944. Its totient is φ = 195107700.

The previous prime is 201611281. The next prime is 201611339. The reversal of 201611321 is 123116102.

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 201611321 - 2⁶ = 201611257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201611321.

It is not an unprimeable number, because it can be changed into a prime (201611351) 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, 3251765 + ... + 3251826.

It is an arithmetic number, because the mean of its divisors is an integer number (52028736).

Almost surely, 2^201611321 is an apocalyptic number.

It is an amenable number.

201611321 is a deficient number, since it is larger than the sum of its proper divisors (6503623).

201611321 is an equidigital number, since it uses as much as digits as its factorization.

201611321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6503622.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 201611321 is about 14198.9901401473. The cubic root of 201611321 is about 586.3698591543.

Adding to 201611321 its reverse (123116102), we get a palindrome (324727423).

The spelling of 201611321 in words is "two hundred one million, six hundred eleven thousand, three hundred twenty-one".