2021113321 has 4 divisors (see below), whose sum is σ = 2021260500. Its totient is φ = 2020966144.

The previous prime is 2021113291. The next prime is 2021113333. The reversal of 2021113321 is 1233111202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1233111202 = 2 ⋅616555601.

It can be written as a sum of positive squares in 2 ways, for example, as 79477225 + 1941636096 = 8915^2 + 44064^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021113321 - 2¹⁵ = 2021080553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021113295 and 2021113304.

It is not an unprimeable number, because it can be changed into a prime (2021113351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50596 + ... + 81253.

It is an arithmetic number, because the mean of its divisors is an integer number (505315125).

Almost surely, 2^2021113321 is an apocalyptic number.

It is an amenable number.

2021113321 is a deficient number, since it is larger than the sum of its proper divisors (147179).

2021113321 is a wasteful number, since it uses less digits than its factorization.

2021113321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147178.

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

The square root of 2021113321 is about 44956.7939359559. The cubic root of 2021113321 is about 1264.3390592929.

Adding to 2021113321 its reverse (1233111202), we get a palindrome (3254224523).

The spelling of 2021113321 in words is "two billion, twenty-one million, one hundred thirteen thousand, three hundred twenty-one".