53004221 has 4 divisors (see below), whose sum is σ = 53297244. Its totient is φ = 52711200.

The previous prime is 53004191. The next prime is 53004233. The reversal of 53004221 is 12240035.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12240035 = 5 ⋅2448007.

It can be written as a sum of positive squares in 2 ways, for example, as 1322500 + 51681721 = 1150^2 + 7189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53004221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53004221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53034221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146240 + ... + 146601.

It is an arithmetic number, because the mean of its divisors is an integer number (13324311).

Almost surely, 2^53004221 is an apocalyptic number.

It is an amenable number.

53004221 is a deficient number, since it is larger than the sum of its proper divisors (293023).

53004221 is a wasteful number, since it uses less digits than its factorization.

53004221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293022.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 53004221 is about 7280.3997829790. The cubic root of 53004221 is about 375.6385470330.

Adding to 53004221 its reverse (12240035), we get a palindrome (65244256).

The spelling of 53004221 in words is "fifty-three million, four thousand, two hundred twenty-one".