221315 has 4 divisors (see below), whose sum is σ = 265584. Its totient is φ = 177048.

The previous prime is 221311. The next prime is 221317. The reversal of 221315 is 513122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 513122 = 2 ⋅256561.

It is a cyclic number.

It is not a de Polignac number, because 221315 - 2² = 221311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221315.

It is not an unprimeable number, because it can be changed into a prime (221311) 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, 22127 + ... + 22136.

It is an arithmetic number, because the mean of its divisors is an integer number (66396).

2²²¹³¹⁵ is an apocalyptic number.

221315 is a deficient number, since it is larger than the sum of its proper divisors (44269).

221315 is an equidigital number, since it uses as much as digits as its factorization.

221315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44268.

The product of its digits is 60, while the sum is 14.

The square root of 221315 is about 470.4412822021. The cubic root of 221315 is about 60.4881473946.

Adding to 221315 its reverse (513122), we get a palindrome (734437).

The spelling of 221315 in words is "two hundred twenty-one thousand, three hundred fifteen".