245421 has 24 divisors (see below), whose sum is σ = 403104. Its totient is φ = 142560.

The previous prime is 245419. The next prime is 245437. The reversal of 245421 is 124542.

245421 is a `hidden beast` number, since 245 + 421 = 666.

It is not a de Polignac number, because 245421 - 2¹ = 245419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 245394 and 245403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245411) 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 23 ways as a sum of consecutive naturals, for example, 3630 + ... + 3696.

It is an arithmetic number, because the mean of its divisors is an integer number (16796).

2²⁴⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

245421 is a deficient number, since it is larger than the sum of its proper divisors (157683).

245421 is a wasteful number, since it uses less digits than its factorization.

245421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 118 counting only the distinct ones).

The product of its digits is 320, while the sum is 18.

The square root of 245421 is about 495.3998385143. The cubic root of 245421 is about 62.6090682219.

Adding to 245421 its reverse (124542), we get a palindrome (369963).

It can be divided in two parts, 245 and 421, that added together give a palindrome (666).

The spelling of 245421 in words is "two hundred forty-five thousand, four hundred twenty-one".