53201221 has 2 divisors, whose sum is σ = 53201222. Its totient is φ = 53201220.

The previous prime is 53201219. The next prime is 53201237. The reversal of 53201221 is 12210235.

53201221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (53201237) can be obtained adding 53201221 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53144100 + 57121 = 7290^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 53201221 - 2¹ = 53201219 is a prime.

Together with 53201219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 53201195 and 53201204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53201261) 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, 26600610 + 26600611.

It is an arithmetic number, because the mean of its divisors is an integer number (26600611).

Almost surely, 2^53201221 is an apocalyptic number.

It is an amenable number.

53201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

53201221 is an equidigital number, since it uses as much as digits as its factorization.

53201221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 53201221 is about 7293.9167118908. The cubic root of 53201221 is about 376.1033484015.

Adding to 53201221 its reverse (12210235), we get a palindrome (65411456).

The spelling of 53201221 in words is "fifty-three million, two hundred one thousand, two hundred twenty-one".