7105645122721 has 2 divisors, whose sum is σ = 7105645122722. Its totient is φ = 7105645122720.

The previous prime is 7105645122713. The next prime is 7105645122727. The reversal of 7105645122721 is 1272215465017.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7097487420321 + 8157702400 = 2664111^2 + 90320^2 .

It is a cyclic number.

It is not a de Polignac number, because 7105645122721 - 2³ = 7105645122713 is a prime.

It is a super-2 number, since 2×7105645122721² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7105645122727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3552822561360 + 3552822561361.

It is an arithmetic number, because the mean of its divisors is an integer number (3552822561361).

Almost surely, 2^{7105645122721} is an apocalyptic number.

It is an amenable number.

7105645122721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7105645122721 is an equidigital number, since it uses as much as digits as its factorization.

7105645122721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 7105645122721 in words is "seven trillion, one hundred five billion, six hundred forty-five million, one hundred twenty-two thousand, seven hundred twenty-one".