2021100020 has 12 divisors (see below), whose sum is σ = 4244310084. Its totient is φ = 808440000.

The previous prime is 2021100019. The next prime is 2021100023. The reversal of 2021100020 is 200011202.

It can be written as a sum of positive squares in 2 ways, for example, as 1587544336 + 433555684 = 39844^2 + 20822^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2021099980 and 2021100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021100023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50527481 + ... + 50527520.

It is an arithmetic number, because the mean of its divisors is an integer number (353692507).

Almost surely, 2^2021100020 is an apocalyptic number.

2021100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021100020 is an abundant number, since it is smaller than the sum of its proper divisors (2223210064).

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

2021100020 is a wasteful number, since it uses less digits than its factorization.

2021100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101055010 (or 101055008 counting only the distinct ones).

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

The square root of 2021100020 is about 44956.6460047900. The cubic root of 2021100020 is about 1264.3362857373.

Adding to 2021100020 its reverse (200011202), we get a palindrome (2221111222).

The spelling of 2021100020 in words is "two billion, twenty-one million, one hundred thousand, twenty".