221475 has 12 divisors (see below), whose sum is σ = 366296. Its totient is φ = 118080.

The previous prime is 221471. The next prime is 221477. The reversal of 221475 is 574122.

It is not a de Polignac number, because 221475 - 2² = 221471 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 (221471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1402 + ... + 1551.

2²²¹⁴⁷⁵ is an apocalyptic number.

221475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221475 is a deficient number, since it is larger than the sum of its proper divisors (144821).

221475 is a wasteful number, since it uses less digits than its factorization.

221475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2966 (or 2961 counting only the distinct ones).

The product of its digits is 560, while the sum is 21.

The square root of 221475 is about 470.6113045816. The cubic root of 221475 is about 60.5027205479.

Adding to 221475 its reverse (574122), we get a palindrome (795597).

It can be divided in two parts, 221 and 475, that added together give a palindrome (696).

The spelling of 221475 in words is "two hundred twenty-one thousand, four hundred seventy-five".