2021321 has 2 divisors, whose sum is σ = 2021322. Its totient is φ = 2021320.

The previous prime is 2021291. The next prime is 2021333. The reversal of 2021321 is 1231202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1092025 + 929296 = 1045^2 + 964^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2021381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010660 + 1010661.

It is an arithmetic number, because the mean of its divisors is an integer number (1010661).

2^2021321 is an apocalyptic number.

It is an amenable number.

2021321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021321 is an equidigital number, since it uses as much as digits as its factorization.

2021321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2021321 is about 1421.7316905802. The cubic root of 2021321 is about 126.4382363426.

Adding to 2021321 its reverse (1231202), we get a palindrome (3252523).

The spelling of 2021321 in words is "two million, twenty-one thousand, three hundred twenty-one".