221060768729 has 2 divisors, whose sum is σ = 221060768730. Its totient is φ = 221060768728.

The previous prime is 221060768701. The next prime is 221060768737. The reversal of 221060768729 is 927867060122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175829262400 + 45231506329 = 419320^2 + 212677^2 .

It is a cyclic number.

It is not a de Polignac number, because 221060768729 - 2²⁸ = 220792333273 is a prime.

It is not a weakly prime, because it can be changed into another prime (221060768749) 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, 110530384364 + 110530384365.

It is an arithmetic number, because the mean of its divisors is an integer number (110530384365).

Almost surely, 2^221060768729 is an apocalyptic number.

It is an amenable number.

221060768729 is a deficient number, since it is larger than the sum of its proper divisors (1).

221060768729 is an equidigital number, since it uses as much as digits as its factorization.

221060768729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 221060768729 in words is "two hundred twenty-one billion, sixty million, seven hundred sixty-eight thousand, seven hundred twenty-nine".