340221 has 16 divisors (see below), whose sum is σ = 549504. Its totient is φ = 182784.

The previous prime is 340211. The next prime is 340237. The reversal of 340221 is 122043.

It is not a de Polignac number, because 340221 - 2¹⁴ = 323837 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 340197 and 340206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340201) 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 15 ways as a sum of consecutive naturals, for example, 120 + ... + 833.

It is an arithmetic number, because the mean of its divisors is an integer number (34344).

2³⁴⁰²²¹ is an apocalyptic number.

It is an amenable number.

340221 is a deficient number, since it is larger than the sum of its proper divisors (209283).

340221 is a wasteful number, since it uses less digits than its factorization.

340221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 340221 is about 583.2846646364. The cubic root of 340221 is about 69.8104395132.

Adding to 340221 its reverse (122043), we get a palindrome (462264).

It can be divided in two parts, 340 and 221, that added together give a triangular number (561 = T₃₃).

The spelling of 340221 in words is "three hundred forty thousand, two hundred twenty-one", and thus it is an iban number.