21100202010120 has 128 divisors (see below), whose sum is σ = 63624732192000. Its totient is φ = 5597914696704.

The previous prime is 21100202010077. The next prime is 21100202010133. The reversal of 21100202010120 is 2101020200112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21100202010096 and 21100202010105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 295431534 + ... + 295502946.

It is an arithmetic number, because the mean of its divisors is an integer number (497068220250).

Almost surely, 2^{21100202010120} is an apocalyptic number.

21100202010120 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 21100202010120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31812366096000).

21100202010120 is an abundant number, since it is smaller than the sum of its proper divisors (42524530181880).

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

21100202010120 is a wasteful number, since it uses less digits than its factorization.

21100202010120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83999 (or 83995 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21100202010120 its reverse (2101020200112), we get a palindrome (23201222210232).

The spelling of 21100202010120 in words is "twenty-one trillion, one hundred billion, two hundred two million, ten thousand, one hundred twenty".