53504221 has 4 divisors (see below), whose sum is σ = 54809244. Its totient is φ = 52199200.

The previous prime is 53504201. The next prime is 53504309. The reversal of 53504221 is 12240535.

53504221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12240535 = 5 ⋅2448107.

It can be written as a sum of positive squares in 2 ways, for example, as 1822500 + 51681721 = 1350^2 + 7189^2 .

It is a cyclic number.

It is not a de Polignac number, because 53504221 - 2¹¹ = 53502173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53504192 and 53504201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53504201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 652450 + ... + 652531.

It is an arithmetic number, because the mean of its divisors is an integer number (13702311).

Almost surely, 2^53504221 is an apocalyptic number.

It is an amenable number.

53504221 is a deficient number, since it is larger than the sum of its proper divisors (1305023).

53504221 is a wasteful number, since it uses less digits than its factorization.

53504221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305022.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 53504221 is about 7314.6579550926. The cubic root of 53504221 is about 376.8160115573.

Adding to 53504221 its reverse (12240535), we get a palindrome (65744756).

The spelling of 53504221 in words is "fifty-three million, five hundred four thousand, two hundred twenty-one".