21120012110012 has 12 divisors (see below), whose sum is σ = 36967787567760. Its totient is φ = 10557787090656.

The previous prime is 21120012110011. The next prime is 21120012110063. The reversal of 21120012110012 is 21001121002112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120012110011) 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, 554719673 + ... + 554757744.

It is an arithmetic number, because the mean of its divisors is an integer number (3080648963980).

Almost surely, 2^{21120012110012} is an apocalyptic number.

It is an amenable number.

21120012110012 is a deficient number, since it is larger than the sum of its proper divisors (15847775457748).

21120012110012 is a wasteful number, since it uses less digits than its factorization.

21120012110012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109482180 (or 1109482178 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21120012110012 its reverse (21001121002112), we get a palindrome (42121133112124).

The spelling of 21120012110012 in words is "twenty-one trillion, one hundred twenty billion, twelve million, one hundred ten thousand, twelve".