2021100120020 has 12 divisors (see below), whose sum is σ = 4244310252084. Its totient is φ = 808440048000.

The previous prime is 2021100120007. The next prime is 2021100120029. The reversal of 2021100120020 is 200210011202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 606984344464 + 1414115775556 = 779092^2 + 1189166^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2021100119983 and 2021100120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021100120029) 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, 50527502981 + ... + 50527503020.

It is an arithmetic number, because the mean of its divisors is an integer number (353692521007).

Almost surely, 2^{2021100120020} is an apocalyptic number.

2021100120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021100120020 is an abundant number, since it is smaller than the sum of its proper divisors (2223210132064).

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

2021100120020 is a wasteful number, since it uses less digits than its factorization.

2021100120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101055006010 (or 101055006008 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2021100120020 its reverse (200210011202), we get a palindrome (2221310131222).

The spelling of 2021100120020 in words is "two trillion, twenty-one billion, one hundred million, one hundred twenty thousand, twenty".