21100111102 has 64 divisors (see below), whose sum is σ = 39688704000. Its totient is φ = 8203249152.

The previous prime is 21100111099. The next prime is 21100111103. The reversal of 21100111102 is 20111100112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100111103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4546099 + ... + 4550737.

It is an arithmetic number, because the mean of its divisors is an integer number (620136000).

Almost surely, 2^21100111102 is an apocalyptic number.

21100111102 is a deficient number, since it is larger than the sum of its proper divisors (18588592898).

21100111102 is a wasteful number, since it uses less digits than its factorization.

21100111102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5353.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21100111102 its reverse (20111100112), we get a palindrome (41211211214).

The spelling of 21100111102 in words is "twenty-one billion, one hundred million, one hundred eleven thousand, one hundred two".