52447515221 has 2 divisors, whose sum is σ = 52447515222. Its totient is φ = 52447515220.

The previous prime is 52447515097. The next prime is 52447515277. The reversal of 52447515221 is 12251574425.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46117562500 + 6329952721 = 214750^2 + 79561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52447515221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52447515521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26223757610 + 26223757611.

It is an arithmetic number, because the mean of its divisors is an integer number (26223757611).

Almost surely, 2^52447515221 is an apocalyptic number.

It is an amenable number.

52447515221 is a deficient number, since it is larger than the sum of its proper divisors (1).

52447515221 is an equidigital number, since it uses as much as digits as its factorization.

52447515221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112000, while the sum is 38.

The spelling of 52447515221 in words is "fifty-two billion, four hundred forty-seven million, five hundred fifteen thousand, two hundred twenty-one".