53421520 has 20 divisors (see below), whose sum is σ = 124205220. Its totient is φ = 21368576.

The previous prime is 53421503. The next prime is 53421527. The reversal of 53421520 is 2512435.

53421520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 29333056 + 24088464 = 5416^2 + 4908^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×53421520² = 5707717598220800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 53421491 and 53421500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53421527) 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, 333805 + ... + 333964.

It is an arithmetic number, because the mean of its divisors is an integer number (6210261).

Almost surely, 2^53421520 is an apocalyptic number.

It is an amenable number.

53421520 is an abundant number, since it is smaller than the sum of its proper divisors (70783700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53421520 is a wasteful number, since it uses less digits than its factorization.

53421520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667782 (or 667776 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 53421520 is about 7309.0026679431. The cubic root of 53421520 is about 376.6217643849.

Adding to 53421520 its reverse (2512435), we get a palindrome (55933955).

The spelling of 53421520 in words is "fifty-three million, four hundred twenty-one thousand, five hundred twenty".