221219 has 2 divisors, whose sum is σ = 221220. Its totient is φ = 221218.

The previous prime is 221209. The next prime is 221227. The reversal of 221219 is 912122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221219 - 2⁴ = 221203 is a prime.

It is a super-2 number, since 2×221219² = 97875691922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 221197 and 221206.

It is not a weakly prime, because it can be changed into another prime (221209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110609 + 110610.

It is an arithmetic number, because the mean of its divisors is an integer number (110610).

2²²¹²¹⁹ is an apocalyptic number.

221219 is a deficient number, since it is larger than the sum of its proper divisors (1).

221219 is an equidigital number, since it uses as much as digits as its factorization.

221219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 17.

The square root of 221219 is about 470.3392392731. The cubic root of 221219 is about 60.4794001310.

The spelling of 221219 in words is "two hundred twenty-one thousand, two hundred nineteen".