53121643 has 4 divisors (see below), whose sum is σ = 53328600. Its totient is φ = 52914688.

The previous prime is 53121637. The next prime is 53121659. The reversal of 53121643 is 34612135.

53121643 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: 34612135 = 5 ⋅6922427.

It is a cyclic number.

It is not a de Polignac number, because 53121643 - 2¹⁷ = 52990571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53121623) 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, 103093 + ... + 103606.

It is an arithmetic number, because the mean of its divisors is an integer number (13332150).

Almost surely, 2^53121643 is an apocalyptic number.

53121643 is a deficient number, since it is larger than the sum of its proper divisors (206957).

53121643 is a wasteful number, since it uses less digits than its factorization.

53121643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206956.

The product of its digits is 2160, while the sum is 25.

The square root of 53121643 is about 7288.4595766184. The cubic root of 53121643 is about 375.9157306056.

Adding to 53121643 its reverse (34612135), we get a palindrome (87733778).

The spelling of 53121643 in words is "fifty-three million, one hundred twenty-one thousand, six hundred forty-three".