7121734081261 has 2 divisors, whose sum is σ = 7121734081262. Its totient is φ = 7121734081260.

The previous prime is 7121734081177. The next prime is 7121734081271. The reversal of 7121734081261 is 1621804371217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5854556105161 + 1267177976100 = 2419619^2 + 1125690^2 .

It is a cyclic number.

It is not a de Polignac number, because 7121734081261 - 2⁹ = 7121734080749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7121734081271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3560867040630 + 3560867040631.

It is an arithmetic number, because the mean of its divisors is an integer number (3560867040631).

Almost surely, 2^{7121734081261} is an apocalyptic number.

It is an amenable number.

7121734081261 is a deficient number, since it is larger than the sum of its proper divisors (1).

7121734081261 is an equidigital number, since it uses as much as digits as its factorization.

7121734081261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 43.

The spelling of 7121734081261 in words is "seven trillion, one hundred twenty-one billion, seven hundred thirty-four million, eighty-one thousand, two hundred sixty-one".