2021021100220 has 24 divisors (see below), whose sum is σ = 4254273550800. Its totient is φ = 806479060992.

The previous prime is 2021021100199. The next prime is 2021021100257. The reversal of 2021021100220 is 220011201202.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021021100220.

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, 120577605 + ... + 120594364.

It is an arithmetic number, because the mean of its divisors is an integer number (177261397950).

Almost surely, 2^{2021021100220} is an apocalyptic number.

2021021100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021021100220 is an abundant number, since it is smaller than the sum of its proper divisors (2233252450580).

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

2021021100220 is a wasteful number, since it uses less digits than its factorization.

2021021100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241172397 (or 241172395 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2021021100220 its reverse (220011201202), we get a palindrome (2241032301422).

The spelling of 2021021100220 in words is "two trillion, twenty-one billion, twenty-one million, one hundred thousand, two hundred twenty".