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212221 = 239227
BaseRepresentation
bin110011110011111101
3101210010001
4303303331
523242341
64314301
71542502
oct636375
9353101
10212221
11135499
12a2991
1375799
14574a9
1542d31
hex33cfd

212221 has 4 divisors (see below), whose sum is σ = 221472. Its totient is φ = 202972.

The previous prime is 212209. The next prime is 212227. The reversal of 212221 is 122212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212221 - 211 = 210173 is a prime.

It is a Duffinian number.

212221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 212198 and 212207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4591 + ... + 4636.

It is an arithmetic number, because the mean of its divisors is an integer number (55368).

2212221 is an apocalyptic number.

It is an amenable number.

212221 is a deficient number, since it is larger than the sum of its proper divisors (9251).

212221 is an equidigital number, since it uses as much as digits as its factorization.

212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9250.

The product of its digits is 16, while the sum is 10.

The square root of 212221 is about 460.6745054808. The cubic root of 212221 is about 59.6480319379.

Adding to 212221 its reverse (122212), we get a palindrome (334433).

Subtracting from 212221 its reverse (122212), we obtain a palindrome (90009).

It can be divided in two parts, 2 and 12221, that multiplied together give a palindrome (24442).

The spelling of 212221 in words is "two hundred twelve thousand, two hundred twenty-one", and thus it is an iban number.

Divisors: 1 23 9227 212221