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7221 = 32983
BaseRepresentation
bin1110000110101
3100220110
41300311
5212341
653233
730024
oct16065
910813
107221
115475
124219
133396
1428bb
152216
hex1c35

7221 has 8 divisors (see below), whose sum is σ = 10080. Its totient is φ = 4592.

The previous prime is 7219. The next prime is 7229. The reversal of 7221 is 1227.

Adding to 7221 its reverse (1227), we get a palindrome (8448).

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 7221 - 21 = 7219 is a prime.

It is a plaindrome in base 14.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 7197 and 7206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46 + ... + 128.

It is an arithmetic number, because the mean of its divisors is an integer number (1260).

27221 is an apocalyptic number.

It is an amenable number.

7221 is a deficient number, since it is larger than the sum of its proper divisors (2859).

7221 is a wasteful number, since it uses less digits than its factorization.

7221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115.

The product of its digits is 28, while the sum is 12.

The square root of 7221 is about 84.9764673307. The cubic root of 7221 is about 19.3285428744.

The spelling of 7221 in words is "seven thousand, two hundred twenty-one", and thus it is an iban number.

Divisors: 1 3 29 83 87 249 2407 7221