21102111111112 has 16 divisors (see below), whose sum is σ = 39566562796800. Its totient is φ = 10551027698640.

The previous prime is 21102111111083. The next prime is 21102111111209. The reversal of 21102111111112 is 21111111120112.

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, 65464 + ... + 6496807.

It is an arithmetic number, because the mean of its divisors is an integer number (2472910174800).

Almost surely, 2^{21102111111112} is an apocalyptic number.

It is an amenable number.

21102111111112 is a deficient number, since it is larger than the sum of its proper divisors (18464451685688).

21102111111112 is a wasteful number, since it uses less digits than its factorization.

21102111111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6964236 (or 6964232 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 21102111111112 its reverse (21111111120112), we get a palindrome (42213222231224).

The spelling of 21102111111112 in words is "twenty-one trillion, one hundred two billion, one hundred eleven million, one hundred eleven thousand, one hundred twelve".