2216221 has 12 divisors (see below), whose sum is σ = 2663040. Its totient is φ = 1837080.

The previous prime is 2216213. The next prime is 2216231. The reversal of 2216221 is 1226122.

It is not a de Polignac number, because 2216221 - 2³ = 2216213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2216195 and 2216204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 790 + ... + 2248.

It is an arithmetic number, because the mean of its divisors is an integer number (221920).

2^2216221 is an apocalyptic number.

2216221 is the 860-th hex number.

It is an amenable number.

2216221 is a deficient number, since it is larger than the sum of its proper divisors (446819).

2216221 is a wasteful number, since it uses less digits than its factorization.

2216221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504 (or 1497 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 2216221 is about 1488.6977530715. The cubic root of 2216221 is about 130.3780121821.

Subtracting from 2216221 its reverse (1226122), we obtain a palindrome (990099).

The spelling of 2216221 in words is "two million, two hundred sixteen thousand, two hundred twenty-one".