118784209721 has 2 divisors, whose sum is σ = 118784209722. Its totient is φ = 118784209720.

The previous prime is 118784209697. The next prime is 118784209741. The reversal of 118784209721 is 127902487811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118240387321 + 543822400 = 343861^2 + 23320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118784209721 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 118784209721.

It is not a weakly prime, because it can be changed into another prime (118784209741) 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, 59392104860 + 59392104861.

It is an arithmetic number, because the mean of its divisors is an integer number (59392104861).

Almost surely, 2^118784209721 is an apocalyptic number.

It is an amenable number.

118784209721 is a deficient number, since it is larger than the sum of its proper divisors (1).

118784209721 is an equidigital number, since it uses as much as digits as its factorization.

118784209721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 50.

The spelling of 118784209721 in words is "one hundred eighteen billion, seven hundred eighty-four million, two hundred nine thousand, seven hundred twenty-one".