201306221 has 2 divisors, whose sum is σ = 201306222. Its totient is φ = 201306220.

The previous prime is 201306199. The next prime is 201306227. The reversal of 201306221 is 122603102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190743721 + 10562500 = 13811^2 + 3250^2 .

It is a cyclic number.

It is not a de Polignac number, because 201306221 - 2²² = 197111917 is a prime.

It is a super-2 number, since 2×201306221² = 81048389226601682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 201306221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201306227) 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 as a sum of consecutive naturals, namely, 100653110 + 100653111.

It is an arithmetic number, because the mean of its divisors is an integer number (100653111).

Almost surely, 2^201306221 is an apocalyptic number.

It is an amenable number.

201306221 is a deficient number, since it is larger than the sum of its proper divisors (1).

201306221 is an equidigital number, since it uses as much as digits as its factorization.

201306221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 201306221 is about 14188.2423506226. The cubic root of 201306221 is about 586.0739237815.

Adding to 201306221 its reverse (122603102), we get a palindrome (323909323).

The spelling of 201306221 in words is "two hundred one million, three hundred six thousand, two hundred twenty-one".