53818921 has 4 divisors (see below), whose sum is σ = 57958852. Its totient is φ = 49678992.

The previous prime is 53818909. The next prime is 53818931. The reversal of 53818921 is 12981835.

53818921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12981835 = 5 ⋅2596367.

It can be written as a sum of positive squares in 2 ways, for example, as 7728400 + 46090521 = 2780^2 + 6789^2 .

It is a cyclic number.

It is not a de Polignac number, because 53818921 - 2¹⁷ = 53687849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53818931) 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 3 ways as a sum of consecutive naturals, for example, 2069946 + ... + 2069971.

It is an arithmetic number, because the mean of its divisors is an integer number (14489713).

Almost surely, 2^53818921 is an apocalyptic number.

It is an amenable number.

53818921 is a deficient number, since it is larger than the sum of its proper divisors (4139931).

53818921 is a wasteful number, since it uses less digits than its factorization.

53818921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4139930.

The product of its digits is 17280, while the sum is 37.

The square root of 53818921 is about 7336.1380166952. The cubic root of 53818921 is about 377.5533506458.

The spelling of 53818921 in words is "fifty-three million, eight hundred eighteen thousand, nine hundred twenty-one".