21120012020112 has 20 divisors (see below), whose sum is σ = 54560031052080. Its totient is φ = 7040004006688.

The previous prime is 21120012020111. The next prime is 21120012020207. The reversal of 21120012020112 is 21102021002112.

It is a junction number, because it is equal to n+sod(n) for n = 21120012020091 and 21120012020100.

It is not an unprimeable number, because it can be changed into a prime (21120012020111) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 220000125162 + ... + 220000125257.

It is an arithmetic number, because the mean of its divisors is an integer number (2728001552604).

Almost surely, 2^{21120012020112} is an apocalyptic number.

It is an amenable number.

21120012020112 is an abundant number, since it is smaller than the sum of its proper divisors (33440019031968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21120012020112 is a wasteful number, since it uses less digits than its factorization.

21120012020112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440000250430 (or 440000250424 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21120012020112 its reverse (21102021002112), we get a palindrome (42222033022224).

The spelling of 21120012020112 in words is "twenty-one trillion, one hundred twenty billion, twelve million, twenty thousand, one hundred twelve".