201321221 has 4 divisors (see below), whose sum is σ = 201393612. Its totient is φ = 201248832.

The previous prime is 201321217. The next prime is 201321229. The reversal of 201321221 is 122123102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122123102 = 2 ⋅61061551.

It can be written as a sum of positive squares in 2 ways, for example, as 121308196 + 80013025 = 11014^2 + 8945^2 .

It is a cyclic number.

It is not a de Polignac number, because 201321221 - 2² = 201321217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201321196 and 201321205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201321229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31850 + ... + 37643.

It is an arithmetic number, because the mean of its divisors is an integer number (50348403).

Almost surely, 2^201321221 is an apocalyptic number.

It is an amenable number.

201321221 is a deficient number, since it is larger than the sum of its proper divisors (72391).

201321221 is an equidigital number, since it uses as much as digits as its factorization.

201321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72390.

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

The square root of 201321221 is about 14188.7709474782. The cubic root of 201321221 is about 586.0884801962.

Adding to 201321221 its reverse (122123102), we get a palindrome (323444323).

The spelling of 201321221 in words is "two hundred one million, three hundred twenty-one thousand, two hundred twenty-one".