21100221010120 has 64 divisors (see below), whose sum is σ = 54264441196800. Its totient is φ = 7233464152320.

The previous prime is 21100221010117. The next prime is 21100221010199. The reversal of 21100221010120 is 2101012200112.

It is a self number, because there is not a number n which added to its sum of digits gives 21100221010120.

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 15 ways as a sum of consecutive naturals, for example, 2410276 + ... + 6928915.

It is an arithmetic number, because the mean of its divisors is an integer number (847881893700).

Almost surely, 2^{21100221010120} is an apocalyptic number.

21100221010120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100221010120 is an abundant number, since it is smaller than the sum of its proper divisors (33164220186680).

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

21100221010120 is a wasteful number, since it uses less digits than its factorization.

21100221010120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9347278 (or 9347274 counting only the distinct ones).

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

Adding to 21100221010120 its reverse (2101012200112), we get a palindrome (23201233210232).

The spelling of 21100221010120 in words is "twenty-one trillion, one hundred billion, two hundred twenty-one million, ten thousand, one hundred twenty".