21112012012012 has 24 divisors (see below), whose sum is σ = 39549710289600. Its totient is φ = 9830927982096.

The previous prime is 21112012012009. The next prime is 21112012012033. The reversal of 21112012012012 is 21021021021112.

21112012012012 is a modest number, since divided by 12012012 gives 21112 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2354144938 + ... + 2354153905.

It is an arithmetic number, because the mean of its divisors is an integer number (1647904595400).

Almost surely, 2^{21112012012012} is an apocalyptic number.

It is an amenable number.

21112012012012 is a deficient number, since it is larger than the sum of its proper divisors (18437698277588).

21112012012012 is a wasteful number, since it uses less digits than its factorization.

21112012012012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4708298925 (or 4708298923 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21112012012012 its reverse (21021021021112), we get a palindrome (42133033033124).

The spelling of 21112012012012 in words is "twenty-one trillion, one hundred twelve billion, twelve million, twelve thousand, twelve".