53005021521 has 8 divisors (see below), whose sum is σ = 70679264160. Its totient is φ = 35333729952.

The previous prime is 53005021501. The next prime is 53005021543. The reversal of 53005021521 is 12512050035.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53005021521 - 2⁶ = 53005021457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 53005021491 and 53005021500.

It is not an unprimeable number, because it can be changed into a prime (53005021501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 695511 + ... + 767948.

It is an arithmetic number, because the mean of its divisors is an integer number (8834908020).

Almost surely, 2^53005021521 is an apocalyptic number.

It is an amenable number.

53005021521 is a deficient number, since it is larger than the sum of its proper divisors (17674242639).

53005021521 is a wasteful number, since it uses less digits than its factorization.

53005021521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475535.

The product of its (nonzero) digits is 1500, while the sum is 24.

Adding to 53005021521 its reverse (12512050035), we get a palindrome (65517071556).

The spelling of 53005021521 in words is "fifty-three billion, five million, twenty-one thousand, five hundred twenty-one".