21142103402317 has 2 divisors, whose sum is σ = 21142103402318. Its totient is φ = 21142103402316.

The previous prime is 21142103402309. The next prime is 21142103402341. The reversal of 21142103402317 is 71320430124112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17221014332041 + 3921089070276 = 4149821^2 + 1980174^2 .

It is a cyclic number.

It is not a de Polignac number, because 21142103402317 - 2³ = 21142103402309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21142103400317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571051701158 + 10571051701159.

It is an arithmetic number, because the mean of its divisors is an integer number (10571051701159).

Almost surely, 2^{21142103402317} is an apocalyptic number.

It is an amenable number.

21142103402317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142103402317 is an equidigital number, since it uses as much as digits as its factorization.

21142103402317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

Adding to 21142103402317 its reverse (71320430124112), we get a palindrome (92462533526429).

The spelling of 21142103402317 in words is "twenty-one trillion, one hundred forty-two billion, one hundred three million, four hundred two thousand, three hundred seventeen".