9212112128 has 18 divisors (see below), whose sum is σ = 18388239954. Its totient is φ = 4606055936.

The previous prime is 9212112121. The next prime is 9212112197. The reversal of 9212112128 is 8212112129.

It can be written as a sum of positive squares in only one way, i.e., 8740006144 + 472105984 = 93488^2 + 21728^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 9212112128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9212112121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17992151 + ... + 17992662.

Almost surely, 2^9212112128 is an apocalyptic number.

It is an amenable number.

9212112128 is a deficient number, since it is larger than the sum of its proper divisors (9176127826).

9212112128 is an equidigital number, since it uses as much as digits as its factorization.

9212112128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35984829 (or 35984815 counting only the distinct ones).

The product of its digits is 1152, while the sum is 29.

The square root of 9212112128 is about 95979.7485306145. The cubic root of 9212112128 is about 2096.2982501988.

Subtracting from 9212112128 its reverse (8212112129), we obtain a palindrome (999999999).

The spelling of 9212112128 in words is "nine billion, two hundred twelve million, one hundred twelve thousand, one hundred twenty-eight".