2721317 has 2 divisors, whose sum is σ = 2721318. Its totient is φ = 2721316.

The previous prime is 2721307. The next prime is 2721319. The reversal of 2721317 is 7131272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2719201 + 2116 = 1649^2 + 46^2 .

It is a cyclic number.

It is not a de Polignac number, because 2721317 - 2¹⁶ = 2655781 is a prime.

Together with 2721319, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2721292 and 2721301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2721319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1360658 + 1360659.

It is an arithmetic number, because the mean of its divisors is an integer number (1360659).

2^2721317 is an apocalyptic number.

It is an amenable number.

2721317 is a deficient number, since it is larger than the sum of its proper divisors (1).

2721317 is an equidigital number, since it uses as much as digits as its factorization.

2721317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 588, while the sum is 23.

The square root of 2721317 is about 1649.6414762002. The cubic root of 2721317 is about 139.6131668218.

Adding to 2721317 its reverse (7131272), we get a palindrome (9852589).

The spelling of 2721317 in words is "two million, seven hundred twenty-one thousand, three hundred seventeen".