218122101221812 has 6 divisors (see below), whose sum is σ = 381713677138178. Its totient is φ = 109061050610904.

The previous prime is 218122101221777. The next prime is 218122101221881.

218122101221812 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 170914153615396 + 47207947606416 = 13073414^2 + 6870804^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27265262652723 + ... + 27265262652730.

Almost surely, 2^{218122101221812} is an apocalyptic number.

It is an amenable number.

218122101221812 is a deficient number, since it is larger than the sum of its proper divisors (163591575916366).

218122101221812 is a wasteful number, since it uses less digits than its factorization.

218122101221812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54530525305457 (or 54530525305455 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 34.

The spelling of 218122101221812 in words is "two hundred eighteen trillion, one hundred twenty-two billion, one hundred one million, two hundred twenty-one thousand, eight hundred twelve".