21201112120012 has 24 divisors (see below), whose sum is σ = 40478473908432. Its totient is φ = 9636006408000.

The previous prime is 21201112120009. The next prime is 21201112120049. The reversal of 21201112120012 is 21002121110212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21071239 + ... + 22054462.

It is an arithmetic number, because the mean of its divisors is an integer number (1686603079518).

Almost surely, 2^{21201112120012} is an apocalyptic number.

21201112120012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21201112120012 is a deficient number, since it is larger than the sum of its proper divisors (19277361788420).

21201112120012 is a wasteful number, since it uses less digits than its factorization.

21201112120012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43136889 (or 43136887 counting only the distinct ones).

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

Adding to 21201112120012 its reverse (21002121110212), we get a palindrome (42203233230224).

The spelling of 21201112120012 in words is "twenty-one trillion, two hundred one billion, one hundred twelve million, one hundred twenty thousand, twelve".