12917212787 has 2 divisors, whose sum is σ = 12917212788. Its totient is φ = 12917212786.

The previous prime is 12917212769. The next prime is 12917212801. The reversal of 12917212787 is 78721271921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12917212787 - 2¹⁴ = 12917196403 is a prime.

It is not a weakly prime, because it can be changed into another prime (12917212717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6458606393 + 6458606394.

It is an arithmetic number, because the mean of its divisors is an integer number (6458606394).

Almost surely, 2^12917212787 is an apocalyptic number.

12917212787 is a deficient number, since it is larger than the sum of its proper divisors (1).

12917212787 is an equidigital number, since it uses as much as digits as its factorization.

12917212787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 197568, while the sum is 47.

The spelling of 12917212787 in words is "twelve billion, nine hundred seventeen million, two hundred twelve thousand, seven hundred eighty-seven".