228221171 has 4 divisors (see below), whose sum is σ = 229218000. Its totient is φ = 227224344.

The previous prime is 228221137. The next prime is 228221173. The reversal of 228221171 is 171122822.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 228221171 - 2¹⁰ = 228220147 is a prime.

It is a super-2 number, since 2×228221171² = 104169805785222482, which contains 22 as substring.

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 228221171.

It is not an unprimeable number, because it can be changed into a prime (228221173) 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, 498071 + ... + 498528.

It is an arithmetic number, because the mean of its divisors is an integer number (57304500).

Almost surely, 2^228221171 is an apocalyptic number.

228221171 is a deficient number, since it is larger than the sum of its proper divisors (996829).

228221171 is an equidigital number, since it uses as much as digits as its factorization.

228221171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996828.

The product of its digits is 896, while the sum is 26.

The square root of 228221171 is about 15106.9907989646. The cubic root of 228221171 is about 611.1089484576.

Adding to 228221171 its reverse (171122822), we get a palindrome (399343993).

The spelling of 228221171 in words is "two hundred twenty-eight million, two hundred twenty-one thousand, one hundred seventy-one".