21021102111112 has 16 divisors (see below), whose sum is σ = 39479499855360. Its totient is φ = 10493235483024.

The previous prime is 21021102111103. The next prime is 21021102111161. The reversal of 21021102111112 is 21111120112012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2164441408 + ... + 2164451119.

It is an arithmetic number, because the mean of its divisors is an integer number (2467468740960).

Almost surely, 2^{21021102111112} is an apocalyptic number.

It is an amenable number.

21021102111112 is a deficient number, since it is larger than the sum of its proper divisors (18458397744248).

21021102111112 is a wasteful number, since it uses less digits than its factorization.

21021102111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4328893140 (or 4328893136 counting only the distinct ones).

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

Adding to 21021102111112 its reverse (21111120112012), we get a palindrome (42132222223124).

Subtracting 21021102111112 from its reverse (21111120112012), we obtain a square (90018000900 = 300030²).

The spelling of 21021102111112 in words is "twenty-one trillion, twenty-one billion, one hundred two million, one hundred eleven thousand, one hundred twelve".