8242721388196 has 27 divisors (see below), whose sum is σ = 15224119745121. Its totient is φ = 3904395295104.

The previous prime is 8242721388191. The next prime is 8242721388217. The reversal of 8242721388196 is 6918831272428.

It is a happy number.

The square root of 8242721388196 is 2871014.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7801910376100 + 440811012096 = 2793190^2 + 663936^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8242721388191) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 109060756 + ... + 109136308.

Almost surely, 2^{8242721388196} is an apocalyptic number.

8242721388196 is the 2871014-th square number.

It is an amenable number.

8242721388196 is a deficient number, since it is larger than the sum of its proper divisors (6981398356925).

8242721388196 is an frugal number, since it uses more digits than its factorization.

8242721388196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151148 (or 75574 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 61.

The spelling of 8242721388196 in words is "eight trillion, two hundred forty-two billion, seven hundred twenty-one million, three hundred eighty-eight thousand, one hundred ninety-six".