A: square of C down.
G: the third power of the sum of A across's digits.
H: divisible by the sum of G across's digits.
I: divisible by digit sum of C down.
J: I across + digit sum of I across.
K: a square number.
L: the reverse of M down.
M: I across multiplied with the digit sum of H across.
N: every digit (except for the last one) is smaller than the subsequent digit.
A: the reverse of C down multiplied with E down.
B: a palindrome.
C: a prime number.
D: the reverse of D down equals A across + F down.
E: the digit sum of A across.
F: the third power of the reverse of E down.
K: a prime number.
L: yet another prime number.
M: the reverse of L across.