2162221 has 2 divisors, whose sum is σ = 2162222. Its totient is φ = 2162220.

The previous prime is 2162203. The next prime is 2162231. The reversal of 2162221 is 1222612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1297321 + 864900 = 1139^2 + 930^2 .

It is a cyclic number.

It is not a de Polignac number, because 2162221 - 2⁵ = 2162189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2162195 and 2162204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2162231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1081110 + 1081111.

It is an arithmetic number, because the mean of its divisors is an integer number (1081111).

2^2162221 is an apocalyptic number.

It is an amenable number.

2162221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2162221 is an equidigital number, since it uses as much as digits as its factorization.

2162221 is an evil number, because the sum of its binary digits is even.

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

The square root of 2162221 is about 1470.4492510794. The cubic root of 2162221 is about 129.3103717754.

Adding to 2162221 its reverse (1222612), we get a palindrome (3384833).

The spelling of 2162221 in words is "two million, one hundred sixty-two thousand, two hundred twenty-one".