228121136 has 20 divisors (see below), whose sum is σ = 444916464. Its totient is φ = 113304000.

The previous prime is 228121133. The next prime is 228121141. The reversal of 228121136 is 631121822.

It is not an unprimeable number, because it can be changed into a prime (228121133) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 44795 + ... + 49626.

Almost surely, 2^228121136 is an apocalyptic number.

It is an amenable number.

228121136 is a deficient number, since it is larger than the sum of its proper divisors (216795328).

228121136 is a wasteful number, since it uses less digits than its factorization.

228121136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94580 (or 94574 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 228121136 is about 15103.6795516854. The cubic root of 228121136 is about 611.0196473387.

Adding to 228121136 its reverse (631121822), we get a palindrome (859242958).

The spelling of 228121136 in words is "two hundred twenty-eight million, one hundred twenty-one thousand, one hundred thirty-six".