1100021128 has 32 divisors (see below), whose sum is σ = 2097307800. Its totient is φ = 540813312.

The previous prime is 1100021107. The next prime is 1100021129. The reversal of 1100021128 is 8211200011.

It can be written as a sum of positive squares in 4 ways, for example, as 1074397284 + 25623844 = 32778^2 + 5062^2 .

It is not an unprimeable number, because it can be changed into a prime (1100021129) 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 7 ways as a sum of consecutive naturals, for example, 117318 + ... + 126346.

Almost surely, 2^1100021128 is an apocalyptic number.

It is an amenable number.

1100021128 is a deficient number, since it is larger than the sum of its proper divisors (997286672).

1100021128 is a wasteful number, since it uses less digits than its factorization.

1100021128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9289 (or 9285 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 1100021128 is about 33166.5664186090. The cubic root of 1100021128 is about 1032.2867245093.

Adding to 1100021128 its reverse (8211200011), we get a palindrome (9311221139).

The spelling of 1100021128 in words is "one billion, one hundred million, twenty-one thousand, one hundred twenty-eight".