2021323231 has 16 divisors (see below), whose sum is σ = 2088646560. Its totient is φ = 1955036160.

The previous prime is 2021323223. The next prime is 2021323243. The reversal of 2021323231 is 1323231202.

It is a cyclic number.

It is not a de Polignac number, because 2021323231 - 2³ = 2021323223 is a prime.

It is a super-2 number, since 2×2021323231² = 8171495208360558722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021323199 and 2021323208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021323261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2293911 + ... + 2294791.

It is an arithmetic number, because the mean of its divisors is an integer number (130540410).

Almost surely, 2^2021323231 is an apocalyptic number.

2021323231 is a deficient number, since it is larger than the sum of its proper divisors (67323329).

2021323231 is a wasteful number, since it uses less digits than its factorization.

2021323231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 2021323231 is about 44959.1284501824. The cubic root of 2021323231 is about 1264.3828286059.

Adding to 2021323231 its reverse (1323231202), we get a palindrome (3344554433).

The spelling of 2021323231 in words is "two billion, twenty-one million, three hundred twenty-three thousand, two hundred thirty-one".