12221707821718 has 8 divisors (see below), whose sum is σ = 18828036374112. Its totient is φ = 5945695697016.

The previous prime is 12221707821667. The next prime is 12221707821727. The reversal of 12221707821718 is 81712870712221.

12221707821718 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82579106830 + ... + 82579106977.

It is an arithmetic number, because the mean of its divisors is an integer number (2353504546764).

Almost surely, 2^{12221707821718} is an apocalyptic number.

12221707821718 is a deficient number, since it is larger than the sum of its proper divisors (6606328552394).

12221707821718 is a wasteful number, since it uses less digits than its factorization.

12221707821718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165158213846.

The product of its (nonzero) digits is 351232, while the sum is 49.

The spelling of 12221707821718 in words is "twelve trillion, two hundred twenty-one billion, seven hundred seven million, eight hundred twenty-one thousand, seven hundred eighteen".