21101110111112 has 8 divisors (see below), whose sum is σ = 39564581458350. Its totient is φ = 10550555055552.

The previous prime is 21101110111057. The next prime is 21101110111121. The reversal of 21101110111112 is 21111101110112.

It can be written as a sum of positive squares in only one way, i.e., 15020476891876 + 6080633219236 = 3875626^2 + 2465894^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1318819381937 + ... + 1318819381952.

Almost surely, 2^{21101110111112} is an apocalyptic number.

It is an amenable number.

21101110111112 is a deficient number, since it is larger than the sum of its proper divisors (18463471347238).

21101110111112 is a wasteful number, since it uses less digits than its factorization.

21101110111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2637638763895 (or 2637638763891 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 21101110111112 its reverse (21111101110112), we get a palindrome (42212211221224).

The spelling of 21101110111112 in words is "twenty-one trillion, one hundred one billion, one hundred ten million, one hundred eleven thousand, one hundred twelve".