21100120021120 has 64 divisors (see below), whose sum is σ = 57648542212800. Its totient is φ = 7234326862848.

The previous prime is 21100120021103. The next prime is 21100120021213. The reversal of 21100120021120 is 2112002100112.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 21100120021120.

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, 2354919630 + ... + 2354928589.

It is an arithmetic number, because the mean of its divisors is an integer number (900758472075).

Almost surely, 2^{21100120021120} is an apocalyptic number.

21100120021120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100120021120 is an abundant number, since it is smaller than the sum of its proper divisors (36548422191680).

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

21100120021120 is an equidigital number, since it uses as much as digits as its factorization.

21100120021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4709848245 (or 4709848233 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21100120021120 its reverse (2112002100112), we get a palindrome (23212122121232).

The spelling of 21100120021120 in words is "twenty-one trillion, one hundred billion, one hundred twenty million, twenty-one thousand, one hundred twenty".