2021231320 has 96 divisors (see below), whose sum is σ = 4923666000. Its totient is φ = 746350592.

The previous prime is 2021231257. The next prime is 2021231321. The reversal of 2021231320 is 231321202.

It is a junction number, because it is equal to n+sod(n) for n = 2021231294 and 2021231303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021231321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 611031 + ... + 614329.

Almost surely, 2^2021231320 is an apocalyptic number.

2021231320 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 2021231320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2461833000).

2021231320 is an abundant number, since it is smaller than the sum of its proper divisors (2902434680).

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

2021231320 is a wasteful number, since it uses less digits than its factorization.

2021231320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3397 (or 3376 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2021231320 is about 44958.1062768440. The cubic root of 2021231320 is about 1264.3636641876.

Adding to 2021231320 its reverse (231321202), we get a palindrome (2252552522).

The spelling of 2021231320 in words is "two billion, twenty-one million, two hundred thirty-one thousand, three hundred twenty".