2021020100020 has 24 divisors (see below), whose sum is σ = 4334443110144. Its totient is φ = 791207868576.

The previous prime is 2021020100009. The next prime is 2021020100041. The reversal of 2021020100020 is 200010201202.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1075009752 + ... + 1075011631.

It is an arithmetic number, because the mean of its divisors is an integer number (180601796256).

Almost surely, 2^{2021020100020} is an apocalyptic number.

2021020100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021020100020 is an abundant number, since it is smaller than the sum of its proper divisors (2313423010124).

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

2021020100020 is a wasteful number, since it uses less digits than its factorization.

2021020100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150021439 (or 2150021437 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 2021020100020 its reverse (200010201202), we get a palindrome (2221030301222).

The spelling of 2021020100020 in words is "two trillion, twenty-one billion, twenty million, one hundred thousand, twenty".