201220321 has 2 divisors, whose sum is σ = 201220322. Its totient is φ = 201220320.

The previous prime is 201220309. The next prime is 201220337. The reversal of 201220321 is 123022102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142468096 + 58752225 = 11936^2 + 7665^2 .

It is a cyclic number.

It is not a de Polignac number, because 201220321 - 2⁵ = 201220289 is a prime.

It is not a weakly prime, because it can be changed into another prime (201220391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610160 + 100610161.

It is an arithmetic number, because the mean of its divisors is an integer number (100610161).

Almost surely, 2^201220321 is an apocalyptic number.

It is an amenable number.

201220321 is a deficient number, since it is larger than the sum of its proper divisors (1).

201220321 is an equidigital number, since it uses as much as digits as its factorization.

201220321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 201220321 is about 14185.2148732404. The cubic root of 201220321 is about 585.9905501161.

Adding to 201220321 its reverse (123022102), we get a palindrome (324242423).

The spelling of 201220321 in words is "two hundred one million, two hundred twenty thousand, three hundred twenty-one".