8211821834 has 8 divisors (see below), whose sum is σ = 12318119940. Its totient is φ = 4105781856.

The previous prime is 8211821833. The next prime is 8211821837. The reversal of 8211821834 is 4381281128.

It can be written as a sum of positive squares in 2 ways, for example, as 6544324609 + 1667497225 = 80897^2 + 40835^2 .

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

It is not an unprimeable number, because it can be changed into a prime (8211821833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77702 + ... + 149870.

Almost surely, 2^8211821834 is an apocalyptic number.

8211821834 is a deficient number, since it is larger than the sum of its proper divisors (4106298106).

8211821834 is a wasteful number, since it uses less digits than its factorization.

8211821834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129064.

The product of its digits is 24576, while the sum is 38.

The square root of 8211821834 is about 90619.1030302110. The cubic root of 8211821834 is about 2017.4982781482.

The spelling of 8211821834 in words is "eight billion, two hundred eleven million, eight hundred twenty-one thousand, eight hundred thirty-four".