218121322418 has 4 divisors (see below), whose sum is σ = 327181983630. Its totient is φ = 109060661208.

The previous prime is 218121322333. The next prime is 218121322427. The reversal of 218121322418 is 814223121812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 168709812049 + 49411510369 = 410743^2 + 222287^2 .

It is a super-2 number, since 2×218121322418² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54530330603 + ... + 54530330606.

Almost surely, 2^218121322418 is an apocalyptic number.

218121322418 is a deficient number, since it is larger than the sum of its proper divisors (109060661212).

218121322418 is a wasteful number, since it uses less digits than its factorization.

218121322418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109060661211.

The product of its digits is 12288, while the sum is 35.

The spelling of 218121322418 in words is "two hundred eighteen billion, one hundred twenty-one million, three hundred twenty-two thousand, four hundred eighteen".