21102028112 has 40 divisors (see below), whose sum is σ = 45018895392. Its totient is φ = 9502179200.

The previous prime is 21102028111. The next prime is 21102028127. The reversal of 21102028112 is 21182020112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102028111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541439 + ... + 579102.

Almost surely, 2^21102028112 is an apocalyptic number.

21102028112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21102028112 is an abundant number, since it is smaller than the sum of its proper divisors (23916867280).

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

21102028112 is a wasteful number, since it uses less digits than its factorization.

21102028112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120667 (or 1120661 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21102028112 its reverse (21182020112), we get a palindrome (42284048224).

The spelling of 21102028112 in words is "twenty-one billion, one hundred two million, twenty-eight thousand, one hundred twelve".