2021320321020 has 432 divisors, whose sum is σ = 8294660337600. Its totient is φ = 387705415680.

The previous prime is 2021320321019. The next prime is 2021320321043. The reversal of 2021320321020 is 201230231202.

2021320321020 is a `hidden beast` number, since 2 + 0 + 2 + 1 + 320 + 321 + 0 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2021320320984 and 2021320321002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1472056 + ... + 2491904.

Almost surely, 2^{2021320321020} is an apocalyptic number.

2021320321020 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 2021320321020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4147330168800).

2021320321020 is an abundant number, since it is smaller than the sum of its proper divisors (6273340016580).

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

2021320321020 is a wasteful number, since it uses less digits than its factorization.

2021320321020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019906 (or 1019890 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 2021320321020 its reverse (201230231202), we get a palindrome (2222550552222).

The spelling of 2021320321020 in words is "two trillion, twenty-one billion, three hundred twenty million, three hundred twenty-one thousand, twenty".