228489221 has 4 divisors (see below), whose sum is σ = 228699744. Its totient is φ = 228278700.

The previous prime is 228489203. The next prime is 228489281. The reversal of 228489221 is 122984822.

228489221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122984822 = 2 ⋅61492411.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228489221 is a prime.

It is a super-2 number, since 2×228489221² = 104414648226373682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228489281) 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, 103625 + ... + 105806.

It is an arithmetic number, because the mean of its divisors is an integer number (57174936).

Almost surely, 2^228489221 is an apocalyptic number.

It is an amenable number.

228489221 is a deficient number, since it is larger than the sum of its proper divisors (210523).

228489221 is a wasteful number, since it uses less digits than its factorization.

228489221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210522.

The product of its digits is 36864, while the sum is 38.

The square root of 228489221 is about 15115.8599159955. The cubic root of 228489221 is about 611.3481077827.

The spelling of 228489221 in words is "two hundred twenty-eight million, four hundred eighty-nine thousand, two hundred twenty-one".