52506221 has 2 divisors, whose sum is σ = 52506222. Its totient is φ = 52506220.

The previous prime is 52506203. The next prime is 52506247. The reversal of 52506221 is 12260525.

52506221 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., 35581225 + 16924996 = 5965^2 + 4114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52506221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52506271) 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, 26253110 + 26253111.

It is an arithmetic number, because the mean of its divisors is an integer number (26253111).

Almost surely, 2^52506221 is an apocalyptic number.

It is an amenable number.

52506221 is a deficient number, since it is larger than the sum of its proper divisors (1).

52506221 is an equidigital number, since it uses as much as digits as its factorization.

52506221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 52506221 is about 7246.1176501627. The cubic root of 52506221 is about 374.4584087054.

Adding to 52506221 its reverse (12260525), we get a palindrome (64766746).

The spelling of 52506221 in words is "fifty-two million, five hundred six thousand, two hundred twenty-one".