260543021 has 2 divisors, whose sum is σ = 260543022. Its totient is φ = 260543020.

The previous prime is 260542981. The next prime is 260543053. The reversal of 260543021 is 120345062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238084900 + 22458121 = 15430^2 + 4739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-260543021 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (260543081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130271510 + 130271511.

It is an arithmetic number, because the mean of its divisors is an integer number (130271511).

Almost surely, 2^260543021 is an apocalyptic number.

It is an amenable number.

260543021 is a deficient number, since it is larger than the sum of its proper divisors (1).

260543021 is an equidigital number, since it uses as much as digits as its factorization.

260543021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 260543021 is about 16141.3450802590. The cubic root of 260543021 is about 638.6944585803.

Adding to 260543021 its reverse (120345062), we get a palindrome (380888083).

The spelling of 260543021 in words is "two hundred sixty million, five hundred forty-three thousand, twenty-one".