21166012761018 has 32 divisors (see below), whose sum is σ = 42866830347264. Its totient is φ = 6966633012912.

The previous prime is 21166012761011. The next prime is 21166012761109. The reversal of 21166012761018 is 81016721066112.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21166012761011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53498130 + ... + 53892317.

It is an arithmetic number, because the mean of its divisors is an integer number (1339588448352).

Almost surely, 2^{21166012761018} is an apocalyptic number.

21166012761018 is an abundant number, since it is smaller than the sum of its proper divisors (21700817586246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21166012761018 is a wasteful number, since it uses less digits than its factorization.

21166012761018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107390866.

The product of its (nonzero) digits is 48384, while the sum is 42.

The spelling of 21166012761018 in words is "twenty-one trillion, one hundred sixty-six billion, twelve million, seven hundred sixty-one thousand, eighteen".