16221219 has 8 divisors (see below), whose sum is σ = 24718080. Its totient is φ = 9269256.

The previous prime is 16221217. The next prime is 16221223. The reversal of 16221219 is 91212261.

16221219 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 16221219 - 2¹ = 16221217 is a prime.

It is a super-2 number, since 2×16221219² = 526255891691922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16221217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386199 + ... + 386240.

It is an arithmetic number, because the mean of its divisors is an integer number (3089760).

Almost surely, 2^16221219 is an apocalyptic number.

16221219 is a deficient number, since it is larger than the sum of its proper divisors (8496861).

16221219 is an equidigital number, since it uses as much as digits as its factorization.

16221219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772449.

The product of its digits is 432, while the sum is 24.

The square root of 16221219 is about 4027.5574483798. The cubic root of 16221219 is about 253.1402254521.

The spelling of 16221219 in words is "sixteen million, two hundred twenty-one thousand, two hundred nineteen".