221347 has 8 divisors (see below), whose sum is σ = 256256. Its totient is φ = 187272.

The previous prime is 221327. The next prime is 221393. The reversal of 221347 is 743122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221347 - 2⁷ = 221219 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 568 + ... + 874.

It is an arithmetic number, because the mean of its divisors is an integer number (32032).

2²²¹³⁴⁷ is an apocalyptic number.

221347 is a deficient number, since it is larger than the sum of its proper divisors (34909).

221347 is a wasteful number, since it uses less digits than its factorization.

221347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417.

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

The square root of 221347 is about 470.4752915935. The cubic root of 221347 is about 60.4910625871.

Adding to 221347 its reverse (743122), we get a palindrome (964469).

It can be divided in two parts, 22 and 1347, that added together give a square (1369 = 37²).

The spelling of 221347 in words is "two hundred twenty-one thousand, three hundred forty-seven", and thus it is an iban number.