21101100112 has 20 divisors (see below), whose sum is σ = 41053029556. Its totient is φ = 10506769920.

The previous prime is 21101100109. The next prime is 21101100127. The reversal of 21101100112 is 21100110112.

It can be written as a sum of positive squares in 2 ways, for example, as 18380851776 + 2720248336 = 135576^2 + 52156^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2732283 + ... + 2739994.

Almost surely, 2^21101100112 is an apocalyptic number.

It is an amenable number.

21101100112 is a deficient number, since it is larger than the sum of its proper divisors (19951929444).

21101100112 is a wasteful number, since it uses less digits than its factorization.

21101100112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5472526 (or 5472520 counting only the distinct ones).

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

Adding to 21101100112 its reverse (21100110112), we get a palindrome (42201210224).

The spelling of 21101100112 in words is "twenty-one billion, one hundred one million, one hundred thousand, one hundred twelve".