228268221 has 16 divisors (see below), whose sum is σ = 315345408. Its totient is φ = 146721600.

The previous prime is 228268219. The next prime is 228268253. The reversal of 228268221 is 122862822.

It is not a de Polignac number, because 228268221 - 2¹ = 228268219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228268121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21331 + ... + 30191.

It is an arithmetic number, because the mean of its divisors is an integer number (19709088).

Almost surely, 2^228268221 is an apocalyptic number.

It is an amenable number.

228268221 is a deficient number, since it is larger than the sum of its proper divisors (87077187).

228268221 is a wasteful number, since it uses less digits than its factorization.

228268221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9172.

The product of its digits is 12288, while the sum is 33.

The square root of 228268221 is about 15108.5479447894. The cubic root of 228268221 is about 611.1509409106.

The spelling of 228268221 in words is "two hundred twenty-eight million, two hundred sixty-eight thousand, two hundred twenty-one".