221212219 has 2 divisors, whose sum is σ = 221212220. Its totient is φ = 221212218.

The previous prime is 221212217. The next prime is 221212223. The reversal of 221212219 is 912212122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221212219 - 2¹ = 221212217 is a prime.

It is a super-2 number, since 2×221212219² = 97869691669807922, which contains 22 as substring.

Together with 221212217, 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 221212219.

It is not a weakly prime, because it can be changed into another prime (221212217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110606109 + 110606110.

It is an arithmetic number, because the mean of its divisors is an integer number (110606110).

Almost surely, 2^221212219 is an apocalyptic number.

221212219 is a deficient number, since it is larger than the sum of its proper divisors (1).

221212219 is an equidigital number, since it uses as much as digits as its factorization.

221212219 is an evil number, because the sum of its binary digits is even.

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

The square root of 221212219 is about 14873.2047320004. The cubic root of 221212219 is about 604.7878216870.

The spelling of 221212219 in words is "two hundred twenty-one million, two hundred twelve thousand, two hundred nineteen".