221307 has 8 divisors (see below), whose sum is σ = 299520. Its totient is φ = 145320.

The previous prime is 221303. The next prime is 221311. The reversal of 221307 is 703122.

It is an interprime number because it is at equal distance from previous prime (221303) and next prime (221311).

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

It is not a de Polignac number, because 221307 - 2² = 221303 is a prime.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (221303) 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, 307 + ... + 732.

It is an arithmetic number, because the mean of its divisors is an integer number (37440).

2²²¹³⁰⁷ is an apocalyptic number.

221307 is a deficient number, since it is larger than the sum of its proper divisors (78213).

221307 is a wasteful number, since it uses less digits than its factorization.

221307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113.

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 221307 is about 470.4327794701. The cubic root of 221307 is about 60.4874185526.

Adding to 221307 its reverse (703122), we get a palindrome (924429).

It can be divided in two parts, 221 and 307, that added together give a triangular number (528 = T₃₂).

The spelling of 221307 in words is "two hundred twenty-one thousand, three hundred seven", and thus it is an iban number.