21010120101020 has 96 divisors (see below), whose sum is σ = 44690802831360. Its totient is φ = 8295887255040.

The previous prime is 21010120101017. The next prime is 21010120101083. The reversal of 21010120101020 is 2010102101012.

It is a junction number, because it is equal to n+sod(n) for n = 21010120100992 and 21010120101010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3449368175 + ... + 3449374265.

It is an arithmetic number, because the mean of its divisors is an integer number (465529196160).

Almost surely, 2^{21010120101020} is an apocalyptic number.

21010120101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010120101020 is an abundant number, since it is smaller than the sum of its proper divisors (23680682730340).

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

21010120101020 is a wasteful number, since it uses less digits than its factorization.

21010120101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9075 (or 9073 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21010120101020 its reverse (2010102101012), we get a palindrome (23020222202032).

The spelling of 21010120101020 in words is "twenty-one trillion, ten billion, one hundred twenty million, one hundred one thousand, twenty".