216420843218 has 4 divisors (see below), whose sum is σ = 324631264830. Its totient is φ = 108210421608.

The previous prime is 216420843181. The next prime is 216420843241. The reversal of 216420843218 is 812348024612.

It is a happy number.

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., 175504858489 + 40915984729 = 418933^2 + 202277^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54105210803 + ... + 54105210806.

Almost surely, 2^216420843218 is an apocalyptic number.

216420843218 is a deficient number, since it is larger than the sum of its proper divisors (108210421612).

216420843218 is a wasteful number, since it uses less digits than its factorization.

216420843218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108210421611.

The product of its (nonzero) digits is 147456, while the sum is 41.

The spelling of 216420843218 in words is "two hundred sixteen billion, four hundred twenty million, eight hundred forty-three thousand, two hundred eighteen".