1247221311797 has 2 divisors, whose sum is σ = 1247221311798. Its totient is φ = 1247221311796.

The previous prime is 1247221311781. The next prime is 1247221311851. The reversal of 1247221311797 is 7971131227421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1194487241476 + 52734070321 = 1092926^2 + 229639^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247221311797 - 2⁴ = 1247221311781 is a prime.

It is a super-2 number, since 2×1247221311797² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1247221311767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623610655898 + 623610655899.

It is an arithmetic number, because the mean of its divisors is an integer number (623610655899).

Almost surely, 2^{1247221311797} is an apocalyptic number.

It is an amenable number.

1247221311797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247221311797 is an equidigital number, since it uses as much as digits as its factorization.

1247221311797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 296352, while the sum is 47.

The spelling of 1247221311797 in words is "one trillion, two hundred forty-seven billion, two hundred twenty-one million, three hundred eleven thousand, seven hundred ninety-seven".