7216721186218 has 8 divisors (see below), whose sum is σ = 11461851295812. Its totient is φ = 3396104087616.

The previous prime is 7216721186179. The next prime is 7216721186261. The reversal of 7216721186218 is 8126811276127.

It can be written as a sum of positive squares in 2 ways, for example, as 7213075804089 + 3645382129 = 2685717^2 + 60377^2 .

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

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, 106128252705 + ... + 106128252772.

Almost surely, 2^{7216721186218} is an apocalyptic number.

7216721186218 is a deficient number, since it is larger than the sum of its proper divisors (4245130109594).

7216721186218 is a wasteful number, since it uses less digits than its factorization.

7216721186218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212256505496.

The product of its digits is 903168, while the sum is 52.

The spelling of 7216721186218 in words is "seven trillion, two hundred sixteen billion, seven hundred twenty-one million, one hundred eighty-six thousand, two hundred eighteen".