221221219 has 2 divisors, whose sum is σ = 221221220. Its totient is φ = 221221218.

The previous prime is 221221213. The next prime is 221221243. The reversal of 221221219 is 912122122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221221219 - 2¹¹ = 221219171 is a prime.

It is a super-2 number, since 2×221221219² = 97877655471691922, 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 221221219.

It is not a weakly prime, because it can be changed into another prime (221221213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610609 + 110610610.

It is an arithmetic number, because the mean of its divisors is an integer number (110610610).

Almost surely, 2^221221219 is an apocalyptic number.

221221219 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221219 is an equidigital number, since it uses as much as digits as its factorization.

221221219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

The square root of 221221219 is about 14873.5072864473. The cubic root of 221221219 is about 604.7960234891.

The spelling of 221221219 in words is "two hundred twenty-one million, two hundred twenty-one thousand, two hundred nineteen".