347221 has 4 divisors (see below), whose sum is σ = 396832. Its totient is φ = 297612.

The previous prime is 347209. The next prime is 347227. The reversal of 347221 is 122743.

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 not a de Polignac number, because 347221 - 2¹⁵ = 314453 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 (347227) 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, 24795 + ... + 24808.

It is an arithmetic number, because the mean of its divisors is an integer number (99208).

2³⁴⁷²²¹ is an apocalyptic number.

It is an amenable number.

347221 is a deficient number, since it is larger than the sum of its proper divisors (49611).

347221 is an equidigital number, since it uses as much as digits as its factorization.

347221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49610.

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

The square root of 347221 is about 589.2546138979. The cubic root of 347221 is about 70.2859729727.

Adding to 347221 its reverse (122743), we get a palindrome (469964).

The spelling of 347221 in words is "three hundred forty-seven thousand, two hundred twenty-one", and thus it is an iban number.