201221321 has 4 divisors (see below), whose sum is σ = 229967232. Its totient is φ = 172475412.

The previous prime is 201221309. The next prime is 201221323. The reversal of 201221321 is 123122102.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 123122102 = 2 ⋅61561051.

It is a cyclic number.

It is not a de Polignac number, because 201221321 - 2¹⁰ = 201220297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201221296 and 201221305.

It is not an unprimeable number, because it can be changed into a prime (201221323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14372945 + ... + 14372958.

It is an arithmetic number, because the mean of its divisors is an integer number (57491808).

Almost surely, 2^201221321 is an apocalyptic number.

It is an amenable number.

201221321 is a deficient number, since it is larger than the sum of its proper divisors (28745911).

201221321 is an equidigital number, since it uses as much as digits as its factorization.

201221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28745910.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 201221321 is about 14185.2501211646. The cubic root of 201221321 is about 585.9915208424.

Adding to 201221321 its reverse (123122102), we get a palindrome (324343423).

The spelling of 201221321 in words is "two hundred one million, two hundred twenty-one thousand, three hundred twenty-one".