47221 has 2 divisors, whose sum is σ = 47222. Its totient is φ = 47220.

The previous prime is 47207. The next prime is 47237. The reversal of 47221 is 12274.

It is an a-pointer prime, because the next prime (47237) can be obtained adding 47221 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34225 + 12996 = 185^2 + 114^2 .

It is a cyclic number.

It is not a de Polignac number, because 47221 - 2⁵ = 47189 is a prime.

It is an Ulam number.

47221 is a lucky number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 47195 and 47204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23610 + 23611.

It is an arithmetic number, because the mean of its divisors is an integer number (23611).

2⁴⁷²²¹ is an apocalyptic number.

It is an amenable number.

47221 is a deficient number, since it is larger than the sum of its proper divisors (1).

47221 is an equidigital number, since it uses as much as digits as its factorization.

47221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112, while the sum is 16.

The square root of 47221 is about 217.3039346169. The cubic root of 47221 is about 36.1447362452.

Adding to 47221 its reverse (12274), we get a palindrome (59495).

It can be divided in two parts, 4 and 7221, that added together give a square (7225 = 85²).

The spelling of 47221 in words is "forty-seven thousand, two hundred twenty-one", and thus it is an iban number.