21102111112 has 16 divisors (see below), whose sum is σ = 39630387600. Its totient is φ = 10534007760.

The previous prime is 21102111103. The next prime is 21102111119. The reversal of 21102111112 is 21111120112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21102111092 and 21102111101.

It is not an unprimeable number, because it can be changed into a prime (21102111119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2125714 + ... + 2135617.

It is an arithmetic number, because the mean of its divisors is an integer number (2476899225).

Almost surely, 2^21102111112 is an apocalyptic number.

It is an amenable number.

21102111112 is a deficient number, since it is larger than the sum of its proper divisors (18528276488).

21102111112 is a wasteful number, since it uses less digits than its factorization.

21102111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4261956 (or 4261952 counting only the distinct ones).

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

Adding to 21102111112 its reverse (21111120112), we get a palindrome (42213231224).

The spelling of 21102111112 in words is "twenty-one billion, one hundred two million, one hundred eleven thousand, one hundred twelve".