53421 has 4 divisors (see below), whose sum is σ = 71232. Its totient is φ = 35612.

The previous prime is 53419. The next prime is 53437. The reversal of 53421 is 12435.

53421 = 73² + 74² + ... + 81².

53421 is digitally balanced in base 2 and base 4, because in such bases 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 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 53421 - 2¹ = 53419 is a prime.

It is a D-number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 53421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53401) 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, 8901 + ... + 8906.

It is an arithmetic number, because the mean of its divisors is an integer number (17808).

2⁵³⁴²¹ is an apocalyptic number.

It is an amenable number.

53421 is a deficient number, since it is larger than the sum of its proper divisors (17811).

53421 is a wasteful number, since it uses less digits than its factorization.

53421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17810.

The product of its digits is 120, while the sum is 15.

The square root of 53421 is about 231.1298336433. The cubic root of 53421 is about 37.6620542381.

Subtracting from 53421 its product of digits (120), we obtain a triangular number (53301 = T₃₂₆).

Adding to 53421 its reverse (12435), we get a palindrome (65856).

It can be divided in two parts, 534 and 21, that added together give a palindrome (555).

The spelling of 53421 in words is "fifty-three thousand, four hundred twenty-one".