53086821 has 4 divisors (see below), whose sum is σ = 70782432. Its totient is φ = 35391212.

The previous prime is 53086807. The next prime is 53086853. The reversal of 53086821 is 12868035.

It is a happy number.

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 not a de Polignac number, because 53086821 - 2¹⁰ = 53085797 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53086861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8847801 + ... + 8847806.

It is an arithmetic number, because the mean of its divisors is an integer number (17695608).

Almost surely, 2^53086821 is an apocalyptic number.

It is an amenable number.

53086821 is a deficient number, since it is larger than the sum of its proper divisors (17695611).

53086821 is a wasteful number, since it uses less digits than its factorization.

53086821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17695610.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 53086821 is about 7286.0703400393. The cubic root of 53086821 is about 375.8335732643.

The spelling of 53086821 in words is "fifty-three million, eighty-six thousand, eight hundred twenty-one".