2021231311 has 8 divisors (see below), whose sum is σ = 2223204048. Its totient is φ = 1837481800.

The previous prime is 2021231257. The next prime is 2021231321. The reversal of 2021231311 is 1131321202.

It is not a de Polignac number, because 2021231311 - 2²³ = 2012842703 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 757960 + ... + 760621.

It is an arithmetic number, because the mean of its divisors is an integer number (277900506).

Almost surely, 2^2021231311 is an apocalyptic number.

2021231311 is a deficient number, since it is larger than the sum of its proper divisors (201972737).

2021231311 is an equidigital number, since it uses as much as digits as its factorization.

2021231311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518614 (or 1518592 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2021231311 is about 44958.1061767508. The cubic root of 2021231311 is about 1264.3636623110.

Adding to 2021231311 its reverse (1131321202), we get a palindrome (3152552513).

It can be divided in two parts, 2021 and 231311, that added together give a palindrome (233332).

The spelling of 2021231311 in words is "two billion, twenty-one million, two hundred thirty-one thousand, three hundred eleven".