867247113036721 has 2 divisors, whose sum is σ = 867247113036722. Its totient is φ = 867247113036720.

The previous prime is 867247113036709. The next prime is 867247113036737. The reversal of 867247113036721 is 127630311742768.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 559307789796721 + 307939323240000 = 23649689^2 + 17548200^2 .

It is a cyclic number.

It is not a de Polignac number, because 867247113036721 - 2¹³ = 867247113028529 is a prime.

It is not a weakly prime, because it can be changed into another prime (867247143036721) 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, 433623556518360 + 433623556518361.

It is an arithmetic number, because the mean of its divisors is an integer number (433623556518361).

Almost surely, 2^{867247113036721} is an apocalyptic number.

It is an amenable number.

867247113036721 is a deficient number, since it is larger than the sum of its proper divisors (1).

867247113036721 is an equidigital number, since it uses as much as digits as its factorization.

867247113036721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14224896, while the sum is 58.

The spelling of 867247113036721 in words is "eight hundred sixty-seven trillion, two hundred forty-seven billion, one hundred thirteen million, thirty-six thousand, seven hundred twenty-one".