221210219 has 4 divisors (see below), whose sum is σ = 221311344. Its totient is φ = 221109096.

The previous prime is 221210207. The next prime is 221210243. The reversal of 221210219 is 912012122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221210219 - 2¹² = 221206123 is a prime.

It is a super-2 number, since 2×221210219² = 97867921980055922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221210219.

It is not an unprimeable number, because it can be changed into a prime (221210419) 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 in 3 ways as a sum of consecutive naturals, for example, 47207 + ... + 51680.

It is an arithmetic number, because the mean of its divisors is an integer number (55327836).

Almost surely, 2^221210219 is an apocalyptic number.

221210219 is a deficient number, since it is larger than the sum of its proper divisors (101125).

221210219 is an equidigital number, since it uses as much as digits as its factorization.

221210219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101124.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 221210219 is about 14873.1374968431. The cubic root of 221210219 is about 604.7859990340.

The spelling of 221210219 in words is "two hundred twenty-one million, two hundred ten thousand, two hundred nineteen".