47711221 has 2 divisors, whose sum is σ = 47711222. Its totient is φ = 47711220.

The previous prime is 47711203. The next prime is 47711291. The reversal of 47711221 is 12211774.

47711221 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., 47472100 + 239121 = 6890^2 + 489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47711221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47711291) 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 as a sum of consecutive naturals, namely, 23855610 + 23855611.

It is an arithmetic number, because the mean of its divisors is an integer number (23855611).

Almost surely, 2^47711221 is an apocalyptic number.

It is an amenable number.

47711221 is a deficient number, since it is larger than the sum of its proper divisors (1).

47711221 is an equidigital number, since it uses as much as digits as its factorization.

47711221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 784, while the sum is 25.

The square root of 47711221 is about 6907.3309606533. The cubic root of 47711221 is about 362.6938378298.

Adding to 47711221 its reverse (12211774), we get a palindrome (59922995).

The spelling of 47711221 in words is "forty-seven million, seven hundred eleven thousand, two hundred twenty-one".