2021597 has 2 divisors, whose sum is σ = 2021598. Its totient is φ = 2021596.

The previous prime is 2021573. The next prime is 2021599. The reversal of 2021597 is 7951202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1999396 + 22201 = 1414^2 + 149^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021597 - 2⁶ = 2021533 is a prime.

Together with 2021599, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010798 + 1010799.

It is an arithmetic number, because the mean of its divisors is an integer number (1010799).

2^2021597 is an apocalyptic number.

It is an amenable number.

2021597 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021597 is an equidigital number, since it uses as much as digits as its factorization.

2021597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 2021597 is about 1421.8287519951. The cubic root of 2021597 is about 126.4439908904.

Adding to 2021597 its reverse (7951202), we get a palindrome (9972799).

The spelling of 2021597 in words is "two million, twenty-one thousand, five hundred ninety-seven".