2221209 has 8 divisors (see below), whose sum is σ = 3290720. Its totient is φ = 1480788.

The previous prime is 2221187. The next prime is 2221217. The reversal of 2221209 is 9021222.

It is not a de Polignac number, because 2221209 - 2⁹ = 2220697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221191 and 2221200.

It is not an unprimeable number, because it can be changed into a prime (2221229) 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, 41107 + ... + 41160.

It is an arithmetic number, because the mean of its divisors is an integer number (411340).

2^2221209 is an apocalyptic number.

It is an amenable number.

2221209 is a deficient number, since it is larger than the sum of its proper divisors (1069511).

2221209 is an equidigital number, since it uses as much as digits as its factorization.

2221209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82276 (or 82270 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2221209 is about 1490.3721011882. The cubic root of 2221209 is about 130.4757518694.

It can be divided in two parts, 222 and 1209, that added together give a triangular number (1431 = T₅₃).

The spelling of 2221209 in words is "two million, two hundred twenty-one thousand, two hundred nine".