1312221332987 has 2 divisors, whose sum is σ = 1312221332988. Its totient is φ = 1312221332986.

The previous prime is 1312221332971. The next prime is 1312221333019. The reversal of 1312221332987 is 7892331222131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1312221332987 - 2⁴ = 1312221332971 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312221332957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656110666493 + 656110666494.

It is an arithmetic number, because the mean of its divisors is an integer number (656110666494).

Almost surely, 2^{1312221332987} is an apocalyptic number.

1312221332987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312221332987 is an equidigital number, since it uses as much as digits as its factorization.

1312221332987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The spelling of 1312221332987 in words is "one trillion, three hundred twelve billion, two hundred twenty-one million, three hundred thirty-two thousand, nine hundred eighty-seven".