111111111111228 has 24 divisors (see below), whose sum is σ = 259936176396288. Its totient is φ = 36940334588976.

The previous prime is 111111111111053. The next prime is 111111111111229. The reversal of 111111111111228 is 822111111111111.

It is a plaindrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 111111111111198 and 111111111111207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111111111229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12087801226 + ... + 12087810417.

It is an arithmetic number, because the mean of its divisors is an integer number (10830674016512).

Almost surely, 2^{111111111111228} is an apocalyptic number.

It is an amenable number.

111111111111228 is an abundant number, since it is smaller than the sum of its proper divisors (148825065285060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111111111111228 is a wasteful number, since it uses less digits than its factorization.

111111111111228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24175612033 (or 24175612031 counting only the distinct ones).

The product of its digits is 32, while the sum is 24.

Adding to 111111111111228 its reverse (822111111111111), we get a palindrome (933222222222339).

The spelling of 111111111111228 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty-eight".