53430021521 has 8 divisors (see below), whose sum is σ = 53639081088. Its totient is φ = 53221050000.

The previous prime is 53430021503. The next prime is 53430021523. The reversal of 53430021521 is 12512003435.

It is a happy number.

53430021521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53430021521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53430021523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1363046 + ... + 1401696.

It is an arithmetic number, because the mean of its divisors is an integer number (6704885136).

Almost surely, 2^53430021521 is an apocalyptic number.

It is an amenable number.

53430021521 is a deficient number, since it is larger than the sum of its proper divisors (209059567).

53430021521 is a wasteful number, since it uses less digits than its factorization.

53430021521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44023.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 53430021521 its reverse (12512003435), we get a palindrome (65942024956).

The spelling of 53430021521 in words is "fifty-three billion, four hundred thirty million, twenty-one thousand, five hundred twenty-one".