53316421 has 4 divisors (see below), whose sum is σ = 53387244. Its totient is φ = 53245600.

The previous prime is 53316407. The next prime is 53316469. The reversal of 53316421 is 12461335.

53316421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4456321 + 48860100 = 2111^2 + 6990^2 .

It is a cyclic number.

It is not a de Polignac number, because 53316421 - 2⁷ = 53316293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53316481) 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 in 3 ways as a sum of consecutive naturals, for example, 34270 + ... + 35791.

It is an arithmetic number, because the mean of its divisors is an integer number (13346811).

Almost surely, 2^53316421 is an apocalyptic number.

It is an amenable number.

53316421 is a deficient number, since it is larger than the sum of its proper divisors (70823).

53316421 is an equidigital number, since it uses as much as digits as its factorization.

53316421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70822.

The product of its digits is 2160, while the sum is 25.

The square root of 53316421 is about 7301.8094332843. The cubic root of 53316421 is about 376.3746195585.

Adding to 53316421 its reverse (12461335), we get a palindrome (65777756).

The spelling of 53316421 in words is "fifty-three million, three hundred sixteen thousand, four hundred twenty-one".