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BaseRepresentation
bin100010101101
310001021
4202231
532341
614141
76322
oct4255
93037
102221
11173a
121351
13101b
14b49
159d1

2221 has 2 divisors, whose sum is σ = 2222. Its totient is φ = 2220.

The previous prime is 2213. The next prime is 2237. The reversal of 2221 is 1222.

Adding to 2221 its reverse (1222), we get a palindrome (3443).

Subtracting from 2221 its reverse (1222), we obtain a palindrome (999).

It is a happy number.

2221 is nontrivially palindromic in base 6.

2221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2025 + 196 = 45^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221 - 23 = 2213 is a prime.

It is a magnanimous number.

2221 is an undulating number in base 6.

2221 is a lucky number.

It is equal to p331 and since 2221 and 331 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 16.

It is a nialpdrome in base 7 and base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110 + 1111.

It is an arithmetic number, because the mean of its divisors is an integer number (1111).

It is an amenable number.

2221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221 is an equidigital number, since it uses as much as digits as its factorization.

2221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8, while the sum is 7.

The square root of 2221 is about 47.1274866718. The cubic root of 2221 is about 13.0471659460.

The spelling of 2221 in words is "two thousand, two hundred twenty-one", and thus it is an iban number.