275421 has 4 divisors (see below), whose sum is σ = 367232. Its totient is φ = 183612.

The previous prime is 275419. The next prime is 275423. The reversal of 275421 is 124572.

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 an interprime number because it is at equal distance from previous prime (275419) and next prime (275423).

It is not a de Polignac number, because 275421 - 2¹ = 275419 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (275423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45901 + ... + 45906.

It is an arithmetic number, because the mean of its divisors is an integer number (91808).

2²⁷⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

275421 is a deficient number, since it is larger than the sum of its proper divisors (91811).

275421 is an equidigital number, since it uses as much as digits as its factorization.

275421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91810.

The product of its digits is 560, while the sum is 21.

The square root of 275421 is about 524.8056783229. The cubic root of 275421 is about 65.0627402105.

Adding to 275421 its reverse (124572), we get a palindrome (399993).

It can be divided in two parts, 2754 and 21, that added together give a triangular number (2775 = T₇₄).

The spelling of 275421 in words is "two hundred seventy-five thousand, four hundred twenty-one".