221300221 has 2 divisors, whose sum is σ = 221300222. Its totient is φ = 221300220.

The previous prime is 221300213. The next prime is 221300243. The reversal of 221300221 is 122003122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221265625 + 34596 = 14875^2 + 186^2 .

It is a cyclic number.

It is not a de Polignac number, because 221300221 - 2³ = 221300213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221300021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110650110 + 110650111.

It is an arithmetic number, because the mean of its divisors is an integer number (110650111).

Almost surely, 2^221300221 is an apocalyptic number.

It is an amenable number.

221300221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221300221 is an equidigital number, since it uses as much as digits as its factorization.

221300221 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 221300221 is about 14876.1628453039. The cubic root of 221300221 is about 604.8680093639.

Adding to 221300221 its reverse (122003122), we get a palindrome (343303343).

The spelling of 221300221 in words is "two hundred twenty-one million, three hundred thousand, two hundred twenty-one".