201221219 has 2 divisors, whose sum is σ = 201221220. Its totient is φ = 201221218.

The previous prime is 201221203. The next prime is 201221243. The reversal of 201221219 is 912122102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201221219 - 2⁴ = 201221203 is a prime.

It is a super-2 number, since 2×201221219² = 80979957951691922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201221219.

It is not a weakly prime, because it can be changed into another prime (201221819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610609 + 100610610.

It is an arithmetic number, because the mean of its divisors is an integer number (100610610).

Almost surely, 2^201221219 is an apocalyptic number.

201221219 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221219 is an equidigital number, since it uses as much as digits as its factorization.

201221219 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 20.

The square root of 201221219 is about 14185.2465258803. The cubic root of 201221219 is about 585.9914218285.

The spelling of 201221219 in words is "two hundred one million, two hundred twenty-one thousand, two hundred nineteen".