53333521 has 2 divisors, whose sum is σ = 53333522. Its totient is φ = 53333520.

The previous prime is 53333477. The next prime is 53333531. The reversal of 53333521 is 12533335.

It is a happy number.

53333521 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., 48650625 + 4682896 = 6975^2 + 2164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53333521 is a prime.

It is not a weakly prime, because it can be changed into another prime (53333531) 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, 26666760 + 26666761.

It is an arithmetic number, because the mean of its divisors is an integer number (26666761).

Almost surely, 2^53333521 is an apocalyptic number.

It is an amenable number.

53333521 is a deficient number, since it is larger than the sum of its proper divisors (1).

53333521 is an equidigital number, since it uses as much as digits as its factorization.

53333521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4050, while the sum is 25.

The square root of 53333521 is about 7302.9802820492. The cubic root of 53333521 is about 376.4148530546.

Adding to 53333521 its reverse (12533335), we get a palindrome (65866856).

The spelling of 53333521 in words is "fifty-three million, three hundred thirty-three thousand, five hundred twenty-one".