47171015547221 has 2 divisors, whose sum is σ = 47171015547222. Its totient is φ = 47171015547220.

The previous prime is 47171015547197. The next prime is 47171015547223. The reversal of 47171015547221 is 12274551017174.

47171015547221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28597242874321 + 18573772672900 = 5347639^2 + 4309730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47171015547221 is a prime.

Together with 47171015547223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47171015547223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23585507773610 + 23585507773611.

It is an arithmetic number, because the mean of its divisors is an integer number (23585507773611).

Almost surely, 2^{47171015547221} is an apocalyptic number.

It is an amenable number.

47171015547221 is a deficient number, since it is larger than the sum of its proper divisors (1).

47171015547221 is an equidigital number, since it uses as much as digits as its factorization.

47171015547221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 548800, while the sum is 47.

The spelling of 47171015547221 in words is "forty-seven trillion, one hundred seventy-one billion, fifteen million, five hundred forty-seven thousand, two hundred twenty-one".