21102100112 has 40 divisors (see below), whose sum is σ = 43208796960. Its totient is φ = 9955872000.

The previous prime is 21102100109. The next prime is 21102100121. The reversal of 21102100112 is 21100120112.

It is a junction number, because it is equal to n+sod(n) for n = 21102100093 and 21102100102.

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 7 ways as a sum of consecutive naturals, for example, 61973 + ... + 214580.

It is an arithmetic number, because the mean of its divisors is an integer number (1080219924).

Almost surely, 2^21102100112 is an apocalyptic number.

It is an amenable number.

21102100112 is an abundant number, since it is smaller than the sum of its proper divisors (22106696848).

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

21102100112 is a wasteful number, since it uses less digits than its factorization.

21102100112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276831 (or 276825 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21102100112 its reverse (21100120112), we get a palindrome (42202220224).

The spelling of 21102100112 in words is "twenty-one billion, one hundred two million, one hundred thousand, one hundred twelve".