273421 has 4 divisors (see below), whose sum is σ = 277344. Its totient is φ = 269500.

The previous prime is 273367. The next prime is 273433. The reversal of 273421 is 124372.

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 a de Polignac number, because none of the positive numbers 2^k-273421 is a prime.

It is a Duffinian number.

273421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (273521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1855 + ... + 1996.

It is an arithmetic number, because the mean of its divisors is an integer number (69336).

2²⁷³⁴²¹ is an apocalyptic number.

273421 is the 280-th centered heptagonal number.

It is an amenable number.

273421 is a deficient number, since it is larger than the sum of its proper divisors (3923).

273421 is an equidigital number, since it uses as much as digits as its factorization.

273421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3922.

The product of its digits is 336, while the sum is 19.

The square root of 273421 is about 522.8967393281. The cubic root of 273421 is about 64.9048707055.

Adding to 273421 its reverse (124372), we get a palindrome (397793).

The spelling of 273421 in words is "two hundred seventy-three thousand, four hundred twenty-one", and thus it is an iban number.