2021573 has 2 divisors, whose sum is σ = 2021574. Its totient is φ = 2021572.

The previous prime is 2021567. The next prime is 2021597. The reversal of 2021573 is 3751202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1304164 + 717409 = 1142^2 + 847^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021573 - 2¹⁴ = 2005189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010786 + 1010787.

It is an arithmetic number, because the mean of its divisors is an integer number (1010787).

2^2021573 is an apocalyptic number.

It is an amenable number.

2021573 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021573 is an equidigital number, since it uses as much as digits as its factorization.

2021573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 2021573 is about 1421.8203121351. The cubic root of 2021573 is about 126.4434905157.

Adding to 2021573 its reverse (3751202), we get a palindrome (5772775).

The spelling of 2021573 in words is "two million, twenty-one thousand, five hundred seventy-three".