21100110212 has 12 divisors (see below), whose sum is σ = 36970065216. Its totient is φ = 10537234440.

The previous prime is 21100110181. The next prime is 21100110257. The reversal of 21100110212 is 21201100112.

It is a junction number, because it is equal to n+sod(n) for n = 21100110193 and 21100110202.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3201464 + ... + 3208047.

It is an arithmetic number, because the mean of its divisors is an integer number (3080838768).

Almost surely, 2^21100110212 is an apocalyptic number.

It is an amenable number.

21100110212 is a deficient number, since it is larger than the sum of its proper divisors (15869955004).

21100110212 is a wasteful number, since it uses less digits than its factorization.

21100110212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6410338 (or 6410336 counting only the distinct ones).

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

Adding to 21100110212 its reverse (21201100112), we get a palindrome (42301210324).

The spelling of 21100110212 in words is "twenty-one billion, one hundred million, one hundred ten thousand, two hundred twelve".