221231219 has 8 divisors (see below), whose sum is σ = 241740480. Its totient is φ = 200788200.

The previous prime is 221231207. The next prime is 221231233. The reversal of 221231219 is 912132122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221231219 is a prime.

It is a super-2 number, since 2×221231219² = 97886504520451922, 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 = 221231194 and 221231203.

It is not an unprimeable number, because it can be changed into a prime (221231239) 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 7 ways as a sum of consecutive naturals, for example, 9437 + ... + 23054.

It is an arithmetic number, because the mean of its divisors is an integer number (30217560).

Almost surely, 2^221231219 is an apocalyptic number.

221231219 is a deficient number, since it is larger than the sum of its proper divisors (20509261).

221231219 is a wasteful number, since it uses less digits than its factorization.

221231219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33121.

The product of its digits is 432, while the sum is 23.

The square root of 221231219 is about 14873.8434508368. The cubic root of 221231219 is about 604.8051363418.

The spelling of 221231219 in words is "two hundred twenty-one million, two hundred thirty-one thousand, two hundred nineteen".