53021520 has 80 divisors (see below), whose sum is σ = 182637120. Its totient is φ = 14138496.

The previous prime is 53021513. The next prime is 53021543. The reversal of 53021520 is 2512035.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×53021520² = 5622563166220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 53021493 and 53021502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10114 + ... + 14433.

It is an arithmetic number, because the mean of its divisors is an integer number (2282964).

Almost surely, 2^53021520 is an apocalyptic number.

It is an amenable number.

53021520 is an abundant number, since it is smaller than the sum of its proper divisors (129615600).

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

53021520 is a wasteful number, since it uses less digits than its factorization.

53021520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24569 (or 24557 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 53021520 is about 7281.5877389481. The cubic root of 53021520 is about 375.6794083348.

Adding to 53021520 its reverse (2512035), we get a palindrome (55533555).

The spelling of 53021520 in words is "fifty-three million, twenty-one thousand, five hundred twenty".