218021385197 has 8 divisors (see below), whose sum is σ = 271818869952. Its totient is φ = 169886793600.

The previous prime is 218021385187. The next prime is 218021385289. The reversal of 218021385197 is 791583120812.

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

It is a cyclic number.

It is not a de Polignac number, because 218021385197 - 2⁴ = 218021385181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218021385107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1415723204 + ... + 1415723357.

It is an arithmetic number, because the mean of its divisors is an integer number (33977358744).

Almost surely, 2^218021385197 is an apocalyptic number.

It is an amenable number.

218021385197 is a deficient number, since it is larger than the sum of its proper divisors (53797484755).

218021385197 is a wasteful number, since it uses less digits than its factorization.

218021385197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2831446579.

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 218021385197 in words is "two hundred eighteen billion, twenty-one million, three hundred eighty-five thousand, one hundred ninety-seven".