2021220012020 has 144 divisors (see below), whose sum is σ = 4701674754000. Its totient is φ = 729302323200.

The previous prime is 2021220012001. The next prime is 2021220012073. The reversal of 2021220012020 is 202100221202.

It can be written as a sum of positive squares in 8 ways, for example, as 2848570384 + 2018371441636 = 53372^2 + 1420694^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2021220011986 and 2021220012004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 443150540 + ... + 443155100.

It is an arithmetic number, because the mean of its divisors is an integer number (32650519125).

Almost surely, 2^{2021220012020} is an apocalyptic number.

2021220012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021220012020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2350837377000).

2021220012020 is an abundant number, since it is smaller than the sum of its proper divisors (2680454741980).

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

2021220012020 is a wasteful number, since it uses less digits than its factorization.

2021220012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5970 (or 5957 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 2021220012020 its reverse (202100221202), we get a palindrome (2223320233222).

The spelling of 2021220012020 in words is "two trillion, twenty-one billion, two hundred twenty million, twelve thousand, twenty".