21211101112 has 8 divisors (see below), whose sum is σ = 39770814600. Its totient is φ = 10605550552.

The previous prime is 21211101097. The next prime is 21211101137. The reversal of 21211101112 is 21110111212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21211101092 and 21211101101.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1325693812 + ... + 1325693827.

It is an arithmetic number, because the mean of its divisors is an integer number (4971351825).

Almost surely, 2^21211101112 is an apocalyptic number.

It is an amenable number.

21211101112 is a deficient number, since it is larger than the sum of its proper divisors (18559713488).

21211101112 is a wasteful number, since it uses less digits than its factorization.

21211101112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651387645 (or 2651387641 counting only the distinct ones).

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

Adding to 21211101112 its reverse (21110111212), we get a palindrome (42321212324).

The spelling of 21211101112 in words is "twenty-one billion, two hundred eleven million, one hundred one thousand, one hundred twelve".