235421 has 4 divisors (see below), whose sum is σ = 236412. Its totient is φ = 234432.

The previous prime is 235397. The next prime is 235439. The reversal of 235421 is 124532.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 151321 + 84100 = 389^2 + 290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-235421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 235421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (235441) 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, 101 + ... + 693.

It is an arithmetic number, because the mean of its divisors is an integer number (59103).

2²³⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

235421 is a deficient number, since it is larger than the sum of its proper divisors (991).

235421 is an equidigital number, since it uses as much as digits as its factorization.

235421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990.

The product of its digits is 240, while the sum is 17.

The square root of 235421 is about 485.2020197815. The cubic root of 235421 is about 61.7468869144.

Adding to 235421 its reverse (124532), we get a palindrome (359953).

Subtracting from 235421 its reverse (124532), we obtain a square (110889 = 333²).

It can be divided in two parts, 235 and 421, that added together give a palindrome (656).

The spelling of 235421 in words is "two hundred thirty-five thousand, four hundred twenty-one".