2021321331220 has 96 divisors (see below), whose sum is σ = 4507579238400. Its totient is φ = 759731094144.

The previous prime is 2021321331181. The next prime is 2021321331229. The reversal of 2021321331220 is 221331231202.

It is a junction number, because it is equal to n+sod(n) for n = 2021321331191 and 2021321331200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021321331229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39571737 + ... + 39622783.

It is an arithmetic number, because the mean of its divisors is an integer number (46953950400).

Almost surely, 2^{2021321331220} is an apocalyptic number.

2021321331220 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 2021321331220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2253789619200).

2021321331220 is an abundant number, since it is smaller than the sum of its proper divisors (2486257907180).

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

2021321331220 is a wasteful number, since it uses less digits than its factorization.

2021321331220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52597 (or 52595 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 2021321331220 its reverse (221331231202), we get a palindrome (2242652562422).

The spelling of 2021321331220 in words is "two trillion, twenty-one billion, three hundred twenty-one million, three hundred thirty-one thousand, two hundred twenty".