221320219 has 2 divisors, whose sum is σ = 221320220. Its totient is φ = 221320218.

The previous prime is 221320217. The next prime is 221320223. The reversal of 221320219 is 912023122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221320219 - 2¹ = 221320217 is a prime.

It is a super-2 number, since 2×221320219² = 97965278676415922, which contains 22 as substring.

Together with 221320217, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 221320219.

It is not a weakly prime, because it can be changed into another prime (221320213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110660109 + 110660110.

It is an arithmetic number, because the mean of its divisors is an integer number (110660110).

Almost surely, 2^221320219 is an apocalyptic number.

221320219 is a deficient number, since it is larger than the sum of its proper divisors (1).

221320219 is an equidigital number, since it uses as much as digits as its factorization.

221320219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 221320219 is about 14876.8349792555. The cubic root of 221320219 is about 604.8862286349.

The spelling of 221320219 in words is "two hundred twenty-one million, three hundred twenty thousand, two hundred nineteen".