221211219 has 4 divisors (see below), whose sum is σ = 294948296. Its totient is φ = 147474144.

The previous prime is 221211209. The next prime is 221211223. The reversal of 221211219 is 912112122.

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

It is not a de Polignac number, because 221211219 - 2⁴ = 221211203 is a prime.

It is a super-2 number, since 2×221211219² = 97868806822931922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221211195 and 221211204.

It is not an unprimeable number, because it can be changed into a prime (221211209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36868534 + ... + 36868539.

It is an arithmetic number, because the mean of its divisors is an integer number (73737074).

Almost surely, 2^221211219 is an apocalyptic number.

221211219 is a deficient number, since it is larger than the sum of its proper divisors (73737077).

221211219 is an equidigital number, since it uses as much as digits as its factorization.

221211219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73737076.

The product of its digits is 144, while the sum is 21.

The square root of 221211219 is about 14873.1711144598. The cubic root of 221211219 is about 604.7869103619.

It can be divided in two parts, 2212 and 11219, that added together give a palindrome (13431).

The spelling of 221211219 in words is "two hundred twenty-one million, two hundred eleven thousand, two hundred nineteen".