21010111101020 has 12 divisors (see below), whose sum is σ = 44121233312184. Its totient is φ = 8404044440400.

The previous prime is 21010111101013. The next prime is 21010111101029. The reversal of 21010111101020 is 2010111101012.

21010111101020 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 21010111100992 and 21010111101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010111101029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525252777506 + ... + 525252777545.

It is an arithmetic number, because the mean of its divisors is an integer number (3676769442682).

Almost surely, 2^{21010111101020} is an apocalyptic number.

21010111101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010111101020 is an abundant number, since it is smaller than the sum of its proper divisors (23111122211164).

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

21010111101020 is a wasteful number, since it uses less digits than its factorization.

21010111101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050505555060 (or 1050505555058 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21010111101020 its reverse (2010111101012), we get a palindrome (23020222202032).

The spelling of 21010111101020 in words is "twenty-one trillion, ten billion, one hundred eleven million, one hundred one thousand, twenty".