52187821 has 8 divisors (see below), whose sum is σ = 60079680. Its totient is φ = 44405088.

The previous prime is 52187819. The next prime is 52187831. The reversal of 52187821 is 12878125.

52187821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 52187821 - 2¹ = 52187819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52187831) 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 7 ways as a sum of consecutive naturals, for example, 26251 + ... + 28168.

It is an arithmetic number, because the mean of its divisors is an integer number (7509960).

Almost surely, 2^52187821 is an apocalyptic number.

It is an amenable number.

52187821 is a deficient number, since it is larger than the sum of its proper divisors (7891859).

52187821 is a wasteful number, since it uses less digits than its factorization.

52187821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54563.

The product of its digits is 8960, while the sum is 34.

The square root of 52187821 is about 7224.1138556919. The cubic root of 52187821 is about 373.6999628767.

The spelling of 52187821 in words is "fifty-two million, one hundred eighty-seven thousand, eight hundred twenty-one".