118506127721 has 4 divisors (see below), whose sum is σ = 118738949700. Its totient is φ = 118273305744.

The previous prime is 118506127709. The next prime is 118506127741. The reversal of 118506127721 is 127721605811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127721605811 = 181 ⋅705644231.

It can be written as a sum of positive squares in 2 ways, for example, as 76390879321 + 42115248400 = 276389^2 + 205220^2 .

It is a cyclic number.

It is not a de Polignac number, because 118506127721 - 2⁶ = 118506127657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118506127741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116410226 + ... + 116411243.

It is an arithmetic number, because the mean of its divisors is an integer number (29684737425).

Almost surely, 2^118506127721 is an apocalyptic number.

It is an amenable number.

118506127721 is a deficient number, since it is larger than the sum of its proper divisors (232821979).

118506127721 is an equidigital number, since it uses as much as digits as its factorization.

118506127721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232821978.

The product of its (nonzero) digits is 47040, while the sum is 41.

The spelling of 118506127721 in words is "one hundred eighteen billion, five hundred six million, one hundred twenty-seven thousand, seven hundred twenty-one".