16219221 has 4 divisors (see below), whose sum is σ = 21625632. Its totient is φ = 10812812.

The previous prime is 16219211. The next prime is 16219289. The reversal of 16219221 is 12291261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16219221 - 2¹⁹ = 15694933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16219191 and 16219200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16219211) 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, 2703201 + ... + 2703206.

It is an arithmetic number, because the mean of its divisors is an integer number (5406408).

Almost surely, 2^16219221 is an apocalyptic number.

It is an amenable number.

16219221 is a deficient number, since it is larger than the sum of its proper divisors (5406411).

16219221 is an equidigital number, since it uses as much as digits as its factorization.

16219221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5406410.

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

The square root of 16219221 is about 4027.3093995868. The cubic root of 16219221 is about 253.1298317627.

The spelling of 16219221 in words is "sixteen million, two hundred nineteen thousand, two hundred twenty-one".