207721242317 has 2 divisors, whose sum is σ = 207721242318. Its totient is φ = 207721242316.

The previous prime is 207721242299. The next prime is 207721242341. The reversal of 207721242317 is 713242127702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206364867076 + 1356375241 = 454274^2 + 36829^2 .

It is a cyclic number.

It is not a de Polignac number, because 207721242317 - 2²² = 207717048013 is a prime.

It is a super-2 number, since 2×207721242317² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (207721242367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103860621158 + 103860621159.

It is an arithmetic number, because the mean of its divisors is an integer number (103860621159).

Almost surely, 2^207721242317 is an apocalyptic number.

It is an amenable number.

207721242317 is a deficient number, since it is larger than the sum of its proper divisors (1).

207721242317 is an equidigital number, since it uses as much as digits as its factorization.

207721242317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65856, while the sum is 38.

The spelling of 207721242317 in words is "two hundred seven billion, seven hundred twenty-one million, two hundred forty-two thousand, three hundred seventeen".