53008821 has 6 divisors (see below), whose sum is σ = 76568310. Its totient is φ = 35339208.

The previous prime is 53008807. The next prime is 53008829. The reversal of 53008821 is 12880035.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 34398225 + 18610596 = 5865^2 + 4314^2 .

It is not a de Polignac number, because 53008821 - 2⁵ = 53008789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53008829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2944926 + ... + 2944943.

It is an arithmetic number, because the mean of its divisors is an integer number (12761385).

Almost surely, 2^53008821 is an apocalyptic number.

It is an amenable number.

53008821 is a deficient number, since it is larger than the sum of its proper divisors (23559489).

53008821 is a wasteful number, since it uses less digits than its factorization.

53008821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5889875 (or 5889872 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 53008821 is about 7280.7156928423. The cubic root of 53008821 is about 375.6494133835.

Adding to 53008821 its reverse (12880035), we get a palindrome (65888856).

The spelling of 53008821 in words is "fifty-three million, eight thousand, eight hundred twenty-one".