12701377721 has 2 divisors, whose sum is σ = 12701377722. Its totient is φ = 12701377720.

The previous prime is 12701377669. The next prime is 12701377729. The reversal of 12701377721 is 12777310721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10906669225 + 1794708496 = 104435^2 + 42364^2 .

It is a cyclic number.

It is not a de Polignac number, because 12701377721 - 2⁶ = 12701377657 is a prime.

It is a super-2 number, since 2×12701377721² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12701377729) 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, 6350688860 + 6350688861.

It is an arithmetic number, because the mean of its divisors is an integer number (6350688861).

Almost surely, 2^12701377721 is an apocalyptic number.

It is an amenable number.

12701377721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12701377721 is an equidigital number, since it uses as much as digits as its factorization.

12701377721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28812, while the sum is 38.

The spelling of 12701377721 in words is "twelve billion, seven hundred one million, three hundred seventy-seven thousand, seven hundred twenty-one".