53030021 has 8 divisors (see below), whose sum is σ = 61254144. Its totient is φ = 45373120.

The previous prime is 53030011. The next prime is 53030041. The reversal of 53030021 is 12003035.

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-53030021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 53029978 and 53030005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53030011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141605 + ... + 141978.

It is an arithmetic number, because the mean of its divisors is an integer number (7656768).

Almost surely, 2^53030021 is an apocalyptic number.

It is an amenable number.

53030021 is a deficient number, since it is larger than the sum of its proper divisors (8224123).

53030021 is a wasteful number, since it uses less digits than its factorization.

53030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283611.

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 53030021 is about 7282.1714481328. The cubic root of 53030021 is about 375.6994849627.

Adding to 53030021 its reverse (12003035), we get a palindrome (65033056).

The spelling of 53030021 in words is "fifty-three million, thirty thousand, twenty-one".