221147 has 4 divisors (see below), whose sum is σ = 222216. Its totient is φ = 220080.

The previous prime is 221101. The next prime is 221159. The reversal of 221147 is 741122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 741122 = 2 ⋅370561.

It is a cyclic number.

It is not a de Polignac number, because 221147 - 2⁶ = 221083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113 + ... + 674.

It is an arithmetic number, because the mean of its divisors is an integer number (55554).

2²²¹¹⁴⁷ is an apocalyptic number.

221147 is a deficient number, since it is larger than the sum of its proper divisors (1069).

221147 is an equidigital number, since it uses as much as digits as its factorization.

221147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068.

The product of its digits is 112, while the sum is 17.

The square root of 221147 is about 470.2626925453. The cubic root of 221147 is about 60.4728380224.

Adding to 221147 its reverse (741122), we get a palindrome (962269).

The spelling of 221147 in words is "two hundred twenty-one thousand, one hundred forty-seven", and thus it is an iban number.