2168221 has 8 divisors (see below), whose sum is σ = 2376000. Its totient is φ = 1962240.

The previous prime is 2168219. The next prime is 2168239. The reversal of 2168221 is 1228612.

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

It is a cyclic number.

It is not a de Polignac number, because 2168221 - 2¹ = 2168219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2168192 and 2168201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2168291) 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, 4605 + ... + 5053.

It is an arithmetic number, because the mean of its divisors is an integer number (297000).

2^2168221 is an apocalyptic number.

It is an amenable number.

2168221 is a deficient number, since it is larger than the sum of its proper divisors (207779).

2168221 is a wasteful number, since it uses less digits than its factorization.

2168221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899.

The product of its digits is 384, while the sum is 22.

The square root of 2168221 is about 1472.4880305116. The cubic root of 2168221 is about 129.4298701495.

The spelling of 2168221 in words is "two million, one hundred sixty-eight thousand, two hundred twenty-one".