2021313321 has 6 divisors (see below), whose sum is σ = 2919674810. Its totient is φ = 1347542208.

The previous prime is 2021313313. The next prime is 2021313323. The reversal of 2021313321 is 1233131202.

2021313321 is a `hidden beast` number, since 202 + 131 + 332 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1757705625 + 263607696 = 41925^2 + 16236^2 .

It is not a de Polignac number, because 2021313321 - 2³ = 2021313313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021313294 and 2021313303.

It is not an unprimeable number, because it can be changed into a prime (2021313323) 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 5 ways as a sum of consecutive naturals, for example, 112295176 + ... + 112295193.

Almost surely, 2^2021313321 is an apocalyptic number.

It is an amenable number.

2021313321 is a deficient number, since it is larger than the sum of its proper divisors (898361489).

2021313321 is a wasteful number, since it uses less digits than its factorization.

2021313321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224590375 (or 224590372 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 2021313321 is about 44959.0182388361. The cubic root of 2021313321 is about 1264.3807622937.

Adding to 2021313321 its reverse (1233131202), we get a palindrome (3254444523).

The spelling of 2021313321 in words is "two billion, twenty-one million, three hundred thirteen thousand, three hundred twenty-one".