21102110021120 has 80 divisors (see below), whose sum is σ = 50616554047488. Its totient is φ = 8437349253120.

The previous prime is 21102110021099. The next prime is 21102110021137. The reversal of 21102110021120 is 2112001120112.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 21102110021095 and 21102110021104.

It is a congruent number.

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, 4482305 + ... + 7892735.

Almost surely, 2^{21102110021120} is an apocalyptic number.

21102110021120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102110021120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25308277023744).

21102110021120 is an abundant number, since it is smaller than the sum of its proper divisors (29514444026368).

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

21102110021120 is an equidigital number, since it uses as much as digits as its factorization.

21102110021120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3412871 (or 3412855 counting only the distinct ones).

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

Adding to 21102110021120 its reverse (2112001120112), we get a palindrome (23214111141232).

The spelling of 21102110021120 in words is "twenty-one trillion, one hundred two billion, one hundred ten million, twenty-one thousand, one hundred twenty".