53180821 has 4 divisors (see below), whose sum is σ = 53301312. Its totient is φ = 53060332.

The previous prime is 53180801. The next prime is 53180849. The reversal of 53180821 is 12808135.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12808135 = 5 ⋅2561627.

It is a cyclic number.

It is not a de Polignac number, because 53180821 - 2⁵ = 53180789 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 53180821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53180801) 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, 59581 + ... + 60466.

It is an arithmetic number, because the mean of its divisors is an integer number (13325328).

Almost surely, 2^53180821 is an apocalyptic number.

It is an amenable number.

53180821 is a deficient number, since it is larger than the sum of its proper divisors (120491).

53180821 is a wasteful number, since it uses less digits than its factorization.

53180821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120490.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 53180821 is about 7292.5181521886. The cubic root of 53180821 is about 376.0552699988.

Adding to 53180821 its reverse (12808135), we get a palindrome (65988956).

The spelling of 53180821 in words is "fifty-three million, one hundred eighty thousand, eight hundred twenty-one".