201012221 has 2 divisors, whose sum is σ = 201012222. Its totient is φ = 201012220.

The previous prime is 201012187. The next prime is 201012239. The reversal of 201012221 is 122210102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172003225 + 29008996 = 13115^2 + 5386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201012221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201012121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100506110 + 100506111.

It is an arithmetic number, because the mean of its divisors is an integer number (100506111).

Almost surely, 2^201012221 is an apocalyptic number.

It is an amenable number.

201012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

201012221 is an equidigital number, since it uses as much as digits as its factorization.

201012221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 201012221 is about 14177.8778736453. The cubic root of 201012221 is about 585.7884719579.

Adding to 201012221 its reverse (122210102), we get a palindrome (323222323).

It can be divided in two parts, 20101 and 2221, that added together give a palindrome (22322).

The spelling of 201012221 in words is "two hundred one million, twelve thousand, two hundred twenty-one".