52800021 has 12 divisors (see below), whose sum is σ = 76384620. Its totient is φ = 35145600.

The previous prime is 52800017. The next prime is 52800029. The reversal of 52800021 is 12000825.

It can be written as a sum of positive squares in 2 ways, for example, as 42107121 + 10692900 = 6489^2 + 3270^2 .

It is not a de Polignac number, because 52800021 - 2² = 52800017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 52799967 and 52800003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52800029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2125 + ... + 10493.

It is an arithmetic number, because the mean of its divisors is an integer number (6365385).

Almost surely, 2^52800021 is an apocalyptic number.

It is an amenable number.

52800021 is a deficient number, since it is larger than the sum of its proper divisors (23584599).

52800021 is a wasteful number, since it uses less digits than its factorization.

52800021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9076 (or 9073 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 52800021 is about 7266.3622948488. The cubic root of 52800021 is about 375.1555408099.

Adding to 52800021 its reverse (12000825), we get a palindrome (64800846).

The spelling of 52800021 in words is "fifty-two million, eight hundred thousand, twenty-one".