21101121112 has 16 divisors (see below), whose sum is σ = 39613519800. Its totient is φ = 10537515840.

The previous prime is 21101121071. The next prime is 21101121179. The reversal of 21101121112 is 21112110112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21101121092 and 21101121101.

It is a congruent number.

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, 1623714 + ... + 1636657.

Almost surely, 2^21101121112 is an apocalyptic number.

It is an amenable number.

21101121112 is a deficient number, since it is larger than the sum of its proper divisors (18512398688).

21101121112 is a wasteful number, since it uses less digits than its factorization.

21101121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3261186 (or 3261182 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21101121112 its reverse (21112110112), we get a palindrome (42213231224).

The spelling of 21101121112 in words is "twenty-one billion, one hundred one million, one hundred twenty-one thousand, one hundred twelve".