275021 has 4 divisors (see below), whose sum is σ = 282492. Its totient is φ = 267552.

The previous prime is 275003. The next prime is 275027. The reversal of 275021 is 120572.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 126025 + 148996 = 355^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 275021 - 2⁶ = 274957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (275027) 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, 3680 + ... + 3753.

It is an arithmetic number, because the mean of its divisors is an integer number (70623).

2²⁷⁵⁰²¹ is an apocalyptic number.

It is an amenable number.

275021 is a deficient number, since it is larger than the sum of its proper divisors (7471).

275021 is an equidigital number, since it uses as much as digits as its factorization.

275021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7470.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 275021 is about 524.4244464172. The cubic root of 275021 is about 65.0312275986.

Adding to 275021 its reverse (120572), we get a palindrome (395593).

Subtracting from 275021 its reverse (120572), we obtain a square (154449 = 393²).

The spelling of 275021 in words is "two hundred seventy-five thousand, twenty-one".