21102112012120 has 128 divisors (see below), whose sum is σ = 48105389376000. Its totient is φ = 8330370048000.

The previous prime is 21102112012039. The next prime is 21102112012249. The reversal of 21102112012120 is 2121021120112.

It is a junction number, because it is equal to n+sod(n) for n = 21102112012094 and 21102112012103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3271134895 + ... + 3271141345.

It is an arithmetic number, because the mean of its divisors is an integer number (375823354500).

Almost surely, 2^{21102112012120} is an apocalyptic number.

21102112012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102112012120 is an abundant number, since it is smaller than the sum of its proper divisors (27003277363880).

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

21102112012120 is a wasteful number, since it uses less digits than its factorization.

21102112012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9929 (or 9925 counting only the distinct ones).

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

Adding to 21102112012120 its reverse (2121021120112), we get a palindrome (23223133132232).

The spelling of 21102112012120 in words is "twenty-one trillion, one hundred two billion, one hundred twelve million, twelve thousand, one hundred twenty".