53284821 has 4 divisors (see below), whose sum is σ = 71046432. Its totient is φ = 35523212.

The previous prime is 53284801. The next prime is 53284853. The reversal of 53284821 is 12848235.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53284821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53284801) 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, 8880801 + ... + 8880806.

It is an arithmetic number, because the mean of its divisors is an integer number (17761608).

Almost surely, 2^53284821 is an apocalyptic number.

It is an amenable number.

53284821 is a deficient number, since it is larger than the sum of its proper divisors (17761611).

53284821 is a wasteful number, since it uses less digits than its factorization.

53284821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17761610.

The product of its digits is 15360, while the sum is 33.

The square root of 53284821 is about 7299.6452653537. The cubic root of 53284821 is about 376.3002472968.

The spelling of 53284821 in words is "fifty-three million, two hundred eighty-four thousand, eight hundred twenty-one".