221385 has 8 divisors (see below), whose sum is σ = 354240. Its totient is φ = 118064.

The previous prime is 221327. The next prime is 221393. The reversal of 221385 is 583122.

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 221385 - 2⁹ = 220873 is a prime.

It is a super-2 number, since 2×221385² = 98022636450, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221385.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7365 + ... + 7394.

It is an arithmetic number, because the mean of its divisors is an integer number (44280).

2²²¹³⁸⁵ is an apocalyptic number.

It is an amenable number.

221385 is a deficient number, since it is larger than the sum of its proper divisors (132855).

221385 is a wasteful number, since it uses less digits than its factorization.

221385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14767.

The product of its digits is 480, while the sum is 21.

The square root of 221385 is about 470.5156745529. The cubic root of 221385 is about 60.4945240132.

It can be divided in two parts, 221 and 385, that added together give a palindrome (606).

The spelling of 221385 in words is "two hundred twenty-one thousand, three hundred eighty-five".