221146 has 4 divisors (see below), whose sum is σ = 331722. Its totient is φ = 110572.

The previous prime is 221101. The next prime is 221159. The reversal of 221146 is 641122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 641122 = 2 ⋅320561.

It can be written as a sum of positive squares in only one way, i.e., 164025 + 57121 = 405^2 + 239^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55285 + ... + 55288.

2²²¹¹⁴⁶ is an apocalyptic number.

221146 is a deficient number, since it is larger than the sum of its proper divisors (110576).

221146 is a wasteful number, since it uses less digits than its factorization.

221146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110575.

The product of its digits is 96, while the sum is 16.

The square root of 221146 is about 470.2616293086. The cubic root of 221146 is about 60.4727468720.

Adding to 221146 its reverse (641122), we get a palindrome (862268).

The spelling of 221146 in words is "two hundred twenty-one thousand, one hundred forty-six".